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Despite the presence of eicosanoids&#44; cytokines and proteases&#44; histamine is the major cytokine affecting the H1 &#40;85&#37;&#41; and H2 receptors &#40;15&#37;&#41; in the skin&#46; The binding of histamine to H1 receptors causes pruritus &#40;stimulation of C fibers&#41; while binding to the receptors in capillaries leads to vasodilation&#44; increased vascular permeability and edema&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Neuropathic pain can be defined as abnormal pain in the peripheral or central nervous system following injury and results from dysfunctions in the peripheral or central nervous system without peripheral nociceptor stimulation&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> Neuropathic pain is a common problem in clinical practice and can be challenging to diagnose due to methodological differences in definition and assessment&#44; although its estimated prevalence is 7&#37;&#8211;10&#37; in the general population&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> The mechanisms of pain formation are highly diverse and have yet to be fully clarified&#46; Recent studies have reported that mast cells accumulate around nerve sheaths and play a role in the pathophysiology of neuropathic pain by secreting a wide variety of cytokines&#44; including histamine&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Histamine appears in the pathogenesis of both the CSU and neuropathic pain spectra of disorders&#46; The present study investigates the symptoms of neuropathic pain in patients with CSU using scales&#44; as the simplest and easiest method&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Method</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Study sample</span><p id="par0020" class="elsevierStylePara elsevierViewall">This cross-sectional&#44; questionnaire-based and case-controlled study was approved by the local ethics committee &#40;Decree n&#186; 2017-KAEK-189&#95;2019&#46;07&#46;10&#95;04&#41; and was conducted in accordance with the principles of the Declaration of Helsinki&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">After obtaining their informed consent&#44; 51 patients with CSU and 47 sex- and age-matched healthy controls were included in the study&#46; All of the participants were above the age of 18 years&#46; Excluded from the study were those with pregnancy&#44; lactation&#44; alcohol consumption&#44; presence of a major central nervous system disease&#44; cognitive impairment and psychiatric comorbidity&#46; Only CSU patients were included in the study&#46; Patients with chronic inducible urticaria and acute urticaria were excluded&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The body weight and height measurements were obtained for the calculation of Body Mass Index &#40;BMI&#41;&#44; as well as sociodemographic data&#44; disease duration&#44; comorbid diseases&#44; drug use&#44; presence of angioedema and clinical examination results of patients with CSU presenting to dermatology outpatient clinics&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Measurements</span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Urticaria Activity Score for 7 consecutive days &#40;UAS7&#41;</span><p id="par0035" class="elsevierStylePara elsevierViewall">Is an established and widely accepted patient-reported outcome tool for the prospective measurement of CSU activity&#46; UAS7 scores of &#8804; 6 indicate well-controlled&#44; 7&#8211;15 mild&#44; 16&#8211;27 moderate and 28&#8211;42 severe urticarial&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">The short-form McGill Pain Questionnaire &#40;SF-MPQ&#41;</span><p id="par0040" class="elsevierStylePara elsevierViewall">The main component of the SF-MPQ comprises 15 descriptors &#40;11 sensory&#59; 4 affective&#41; that are rated on an intensity scale of 0&#8239;&#61;&#8239;none&#44; 1&#8239;&#61;&#8239;mild&#44; 2&#8239;&#61;&#8239;moderate or 3&#8239;&#61;&#8239;severe&#44; and three pain scores are derived from the sum of the intensity rank values of the words chosen for sensory&#44; affective and total descriptors&#46; The SF-MPQ also includes the Present Pain Intensity index of the standard MPQ and a Visual Analogue Scale &#40;VAS&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a></p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">The Self-Administered Leeds Assessment of Neuropathic Symptoms and Signs &#40;S-LANSS&#41; Questionnaire</span><p id="par0045" class="elsevierStylePara elsevierViewall">Aims to identify the pain of predominantly neuropathic origin&#44; distinct from nociceptive pain&#44; without the need for clinical examination&#46; The S-LANSS is a 5-item questionnaire related to symptoms of pain and with two items related to clinical signs involving self-administered sensory tests for the presence of allodynia and decreased pin-prick sensation&#46; The scores range from 0 to 24&#44; with a score of 12 or greater suggesting neuropathic pain&#46; <a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">The validity and reliability of the Turkish version of these scales were developed&#46;</p></span></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Data analysis</span><p id="par0055" class="elsevierStylePara elsevierViewall">All statistical analyses were performed using the IBM SPSS Statistics &#40;Version 20&#46;0&#46; Armonk&#44; NY&#58; IBM Corp&#46;&#41; software package program&#46; Continuous variables were expressed as mean&#8239;&#177;&#8239;SD&#44; and Student&#8217;s <span class="elsevierStyleItalic">t</span>-tests were used to compare the means between the two groups&#46; For categorical variables&#44; a Chi-Square test was used to test the differences between groups&#46; Spearman&#8217;s correlation analysis was used for the correlation between neuropathy tests and disease characteristics&#46; Unless otherwise stated&#44; p&#8239;&#60;&#8239;0&#46;05 was set as the level of significance&#46;</p></span></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Results</span><p id="par0060" class="elsevierStylePara elsevierViewall">The study included 51 patients &#40;36 females&#44; 15 males&#41; and 47 controls &#40;27 females&#44; 20 males&#41;&#44; and the two groups had similar sociodemographic characteristics &#40;p&#8239;&#60;&#8239;0&#46;05&#41;&#46; In the patient group&#44; 18 were on omalizumab and 18 were on antihistamines&#44; while the remainder were not receiving treatment at the time of admission &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0065" class="elsevierStylePara elsevierViewall">An assessment of the results of the short-form McGill Pain Questionnaire revealed the scores in the sensory and affective domains&#44; VAS scores and pain indices to be significantly higher in the patient group &#40;p&#8239;&#60;&#8239;0&#46;05 for all cases&#41;&#44; while the overall pain assessment and sensory assessment based on the S-LANSS pain scale were also significantly higher in the patient group&#46; Based on the assumption that scores of &#62; 12 indicated neuropathy&#44; 27 &#40;53&#37;&#41; of the patients in the patient group and 8 &#40;17&#37;&#41; in the control group were found to have neuropathy &#40;p&#8239;&#60;&#8239;0&#46;05&#41;&#46; An analysis of the results of the questionnaire revealed the median total neuropathy score in the patient group to be 14&#44; which was statistically compatible with the neuropathy findings &#40;range&#58; 0&#8211;33&#41; &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia><p id="par0070" class="elsevierStylePara elsevierViewall">An analysis of the correlations between the disease activation findings &#40;duration of disease&#44; frequency of attacks&#44; urticaria activity score&#44; and presence of angioedema&#41; and neuropathy revealed a statistically strong positive correlation&#44; especially with the urticaria activity score &#40;p&#8239;&#60;&#8239;0&#46;001&#44; rho range&#58; 0&#46;524&#8211;0&#46;969&#41; &#40;<a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia><p id="par0075" class="elsevierStylePara elsevierViewall"><a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a> presents a bar chart of the patient and control group symptoms according to the McGill Questionnaire items&#46; As can be seen from the chart&#44; the descriptors that were statistically strongly significant were aching&#44; heavy&#44; hurtful&#44; gnawing and hot burning &#40;p&#8239;&#60;&#8239;0&#46;001 for all&#41;&#46; As for the affective domain&#44; the strongest significant descriptors were tiring-exhausting &#40;p&#8239;&#60;&#8239;0&#46;001&#41;&#44; sickening and fearful &#40;p&#8239;&#61;&#8239;0&#46;001&#41;&#44; while others were throbbing &#40;p&#8239;&#61;&#8239;0&#46;195&#41;&#44; shooting &#40;p&#8239;&#61;&#8239;0&#46;591&#41;&#44; stabbing &#40;p&#8239;&#61;&#8239;0&#46;041&#41;&#44; sharp &#40;p&#8239;&#61;&#8239;0&#46;042&#41;&#44; cramping &#40;p&#8239;&#61;&#8239;0&#46;591&#41;&#44; splitting &#40;p&#8239;&#61;&#8239;0&#46;090&#41; and punishing-cruel &#40;p&#8239;&#61;&#8239;0&#46;018&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Discussion</span><p id="par0080" class="elsevierStylePara elsevierViewall">In the present study significantly&#44; higher scores were identified in the sensory and affective domains of the short-form McGill Pain Questionnaire&#44; as well as the VAS scores and pain indices in the patient group&#46; The overall pain assessments and sensory assessments identified from the S-LANSS pain scale were also significantly higher in the patient group&#46; Neuropathy was detected in 27 and eight of the patient and control groups&#44; respectively&#46; There was a statistically strong positive correlation between the urticaria activity score&#44; and the neuropathy test scores&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Neuropathic pain is a common problem in clinical practice that affects many aspects of daily life&#44; and that is associated with poor overall health&#44; reduced quality of life&#44; poor sleep&#44; and higher levels of anxiety and depression&#46; The quality-of-life measurements of those with chronic neuropathic pain were found to be as low as in those with depression&#44; coronary artery disease&#44; recent myocardial infarction or uncontrolled diabetes mellitus&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a></p><p id="par0090" class="elsevierStylePara elsevierViewall">Mast cells are immunological cells that are distributed throughout different parts of the body with reported roles in several pathological conditions&#44; such as hypersensitivity&#44; atherosclerosis&#44; pulmonary hypertension and infertility&#46; There have also been studies reporting the importance of their roles in the pathogenesis of neuropathic pain of various etiologies<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> Olsson<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">12</span></a> first reported the role of mast cells in neuropathic pain and demonstrated the degranulation of mast cells in epineurium&#44; perineurium and endoneurial connective tissue in response to trauma&#46; Subsequent studies have revealed the role of increased mast cells in the regions surrounding the nerves and their mediators &#40;primarily histamine and 5-HT&#41; in the etiology of neuropathic pain&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">13&#8211;15</span></a> Considering the pathogenesis of CSU&#44; it seems likely to be mainly a mast cell-derived disease&#46; Cytokines such as histamine and platelet-activating factor&#44; tryptase and leukotrienes released from mast cells cause sensory nerve activation&#44; vasodilation and plasma extravasation&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> As can be seen&#44; mast cells appear in the etiopathogenesis of diseases such as CSU and neuropathic pain&#46; It was hypothesized in the present study that neuropathic pain-related symptoms may be more common in patients with CSU&#46; To the best of our knowledge&#44; however&#44; there has been no study addressing this subject in literature to date&#46; Consequently&#44; the present study is the first to evaluate the relationship between CSU and symptoms of neuropathy&#46;</p><p id="par0095" class="elsevierStylePara elsevierViewall">It has been well established that sensitized mast cells can cause allergies and anaphylaxis&#44; and mast cells are also known to contribute to several biological and pathological processes&#44; such as vascular physiology&#44; pain&#44; itching and cancer&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">17&#8211;19</span></a> Among the previous studies in the literature evaluating the relationship between dermatological diseases and symptoms of neuropathy&#44; Di Carlo et al&#46; examined 118 psoriatic arthritis patients and applied questionnaires through which they detected symptoms of neuropathy in 25&#46;4&#37; of the patients&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">20</span></a> Garcovich et al&#46; evaluated the neuropathic pain symptoms of 110 patients with hidradenitis suppurativa using questionnaires&#44; and classified 33 &#40;30&#37;&#41; of the 110 patients as having &#8220;likely neuropathic pain&#8221;&#44; 32 &#40;29&#46;1&#37;&#41; with &#8220;possible neuropathic pain&#8221; and 45 &#40;40&#46;9&#37;&#41; with &#8220;unlikely neuropathic pain&#8221;&#46; The pain and itching scores were found to be correlated&#44; and the patients reported that their daily activities were significantly impaired due to pain&#46; The authors emphasized the complex and multifactorial factors determining the pain phenotype in hidradenitis suppurativa&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">21</span></a> Eosinophilic perineural inflammation and abnormal mast cell innervation were demonstrated in the histopathology of the lesional and perilesional skin of patients with hidradenitis suppurativa&#44; suggesting a potential anatomical correlate of &#8220;neuropathic&#8221; pain&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">22</span></a> Lipoxygenase-derived inflammatory mediators&#44; eicosanoids and leukotriene B4 are increased in lesional skin&#44; and are known to be inducers of peripheral inflammation and hyperalgesia&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">23</span></a> In light of this information&#44; it is no surprise that patients with hidradenitis suppurativa tend to have accompanying symptoms of neuropathic pain&#46;</p><p id="par0100" class="elsevierStylePara elsevierViewall">Atopic dermatitis presents with severe itching&#44; similar to CSU&#44; and recent studies have reported accompanying pain symptoms in addition to itching in patients with atopic dermatitis&#44; identifying a need to question patients in this regard&#46;<a class="elsevierStyleCrossRefs" href="#bib0120"><span class="elsevierStyleSup">24&#8211;26</span></a> Pain was commonly described as &#8220;burning&#8221; and &#8220;stinging&#8221; by patients with atopic dermatitis<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">26</span></a> who described their experience of itching as painful&#44; throbbing&#44; biting&#44; stinging&#44; burning&#44; sharp&#44; tingling&#44; pinprick-like&#44; and&#47;or associated with crawling sensations&#46;<a class="elsevierStyleCrossRefs" href="#bib0120"><span class="elsevierStyleSup">24&#44;25</span></a> All these clinical characteristics support the partial &#40;but not fully&#41; neuropathic component of itching&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">Wallis et al&#46; examined 35 patients with pachyonychia congenital &#8211; a rare autosomal dominant disorder &#8211; and assessed the severity and type of pain&#44; as the main symptom in these patients&#44; through questionnaires and quantitative sensory tests&#46; The authors reported that 62&#37; of the patients had neuropathic pain and the rest had nociceptive pain symptoms&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">27</span></a> Similarly&#44; Brill et al&#46; made a recent study of the origin of pain in patients with pachyonychia congenital in which 62 patients and 45 controls applied the McGill and Douleur Neuropathique-4 questionnaires and underwent sensory tests&#46; The authors found that pain may be of neuropathic origin and suggested that patients could benefit from neuropathy-oriented treatments&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">28</span></a></p><p id="par0110" class="elsevierStylePara elsevierViewall">This study has some limitations&#44; the main ones being its cross-sectional study design&#44; the small patient sample and the use of self-reported scales&#46; Comorbidities such as type 2 diabetes could be associated with neuropathic pain&#44; but these were present in only a small proportion of the sample&#44; and there was no difference in the comorbidities of the two groups&#46; Furthermore&#44; no electrophysiological screening tests could be performed&#44; as a further limitation&#46; The questionnaires applied can be considered valid and reliable for use in screening tests&#44; and in some cases&#44; they may help identify disorders that cannot be detected by electrophysiology&#46;</p></span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Conclusion</span><p id="par0115" class="elsevierStylePara elsevierViewall">In addition to itching&#44; patients with CSU should be aware of the potential for accompanying neuropathic pain&#46; In this chronic disease that is known to affect the quality of life&#44; using an integrated approach with the patients and identifying accompanying problems are as important as treating the dermatological disorder&#46; There is a need for prospective studies of this issue in which descriptive and methodological methods are applied together in large patient series to support the findings of the present study&#46;</p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Financial support</span><p id="par0120" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Authors&#8217; contributions</span><p id="par0125" class="elsevierStylePara elsevierViewall">G&#252;lhan G&#252;rel - Designed the study&#59; recruited the participants&#59; participated in the data collection&#59; interpreted the data&#59; drafted the first manuscript and all authors critically reviewed the paper&#46;</p><p id="par0131" class="elsevierStylePara elsevierViewall">Hikmet Sa&#231;mac&#305; - Designed the study&#59; participated in the data collection&#59; did the statistical analysis&#59; interpreted the data&#46;</p></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Conflicts of interest</span><p id="par0130" class="elsevierStylePara elsevierViewall">None declared&#46;</p></span></span>"
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                  "titulo" => "Urticaria Activity Score for 7 consecutive days &#40;UAS7&#41;"
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                  "titulo" => "The short-form McGill Pain Questionnaire &#40;SF-MPQ&#41;"
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    "fechaRecibido" => "2022-01-05"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Background</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Chronic spontaneous urticaria &#40;CSU&#41; is a condition that is associated with recurrent pruritic hives and&#47;or angioedema lasting for more than 6 weeks and is known to affect 1&#37; of the population&#46; Neuropathic pain can be defined as abnormal pain in the peripheral or central nervous system following injury and results from dysfunctions in the peripheral or central nervous system without peripheral nociceptor stimulation&#46; Histamine appears in the pathogenesis of both the CSU and diseases of the neuropathic pain spectrum&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Objective</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">To evaluate the symptoms of neuropathic pain in patients with CSU using scales&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Method</span><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">Fifty-one patients with CSU and 47 sex- and age-matched healthy controls were included in the study&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Results</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">The results of the short-form McGill Pain Questionnaire revealed the scores in the sensory and affective domains&#44; Visual Analogue Scale &#40;VAS&#41; scores and pain indices to be significantly higher in the patient group &#40;p&#8239;&#60;&#8239;0&#46;05 for all cases&#41;&#44; while the overall pain assessment and sensory assessment based on the Self-Administered Leeds Assessment of Neuropathic Symptoms and Signs &#40;S-LANSS&#41; pain scale were also significantly higher in the patient group&#46; Based on the assumption that scores of &#62; 12 indicated neuropathy&#44; 27 &#40;53&#37;&#41; of the patients in the patient group and 8 &#40;17&#37;&#41; in the control group were found to have neuropathy &#40;p&#8239;&#60;&#8239;0&#46;05&#41;&#46;</p></span> <span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Study limitations</span><p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">Cross-sectional study&#44; small patient sample and use of self-reported scales&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Conclusion</span><p id="spar0070" class="elsevierStyleSimplePara elsevierViewall">In addition to itching&#44; patients with CSU should be aware of the potential for the association of neuropathic pain&#46; In this chronic disease that is known to affect the quality of life&#44; using an integrated approach with the patients and identifying accompanying problems are as important as treating the dermatological disorder&#46;</p></span>"
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Age &#40;median 25&#8211;75pr&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">41 &#40;29&#8210;53&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">39 &#40;31&#8210;53&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;862&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">BMI &#40;median 25&#8211;75pr&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">26&#46;72 &#40;23&#46;50&#8210;31&#46;25&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">26&#46;12 &#40;23&#46;23&#8210;30&#46;81&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;644&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Education status&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;506&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Primary school&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">18 &#40;35&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">11&#40;23&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Secondary school&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">4 &#40;7&#46;8&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">4 &#40;8&#46;5&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">High school&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">10 &#40;19&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8 &#40;17&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">University&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">19 &#40;37&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">24 &#40;50&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Additional disease&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;982&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Hypertension&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5 &#40;9&#46;8&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">4 &#40;8&#46;5&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Diabetes <span class="elsevierStyleItalic">mellitus</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6 &#40;11&#46;8&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5 &#40;10&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Guatr&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8 &#40;15&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6 &#40;12&#46;8&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Others&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3 &#40;5&#46;9&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2 &#40;4&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Disease duration &#40;years&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3 &#40;1&#8210;9&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Urticaria activity score &#40;median 25&#8211;75pr&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">28 &#40;14&#8210;28&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Finding of angioedema &#40;n&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">20 patients&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Therapy of urticeria</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">None&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">15 &#40;29&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " rowspan="3" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " rowspan="3" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8210;</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Antihistaminic&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">18 &#40;35&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">Omalizumab&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">18 &#40;35&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Patients &#40;n&#8239;&#61;&#8239;51&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Sensory score</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">7 &#40;3&#46;75&#8210;16&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">0&#46;000&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2 &#40;0&#8210;6&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">0 &#40;0&#8210;1&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">11 &#40;6&#8210;14&#46;25&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0 &#40;0&#8210;4&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;000&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">0 &#40;0&#8210;6&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">0 &#40;0&#8210;3&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">S-LANSS pain questionnaires</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Pain questionnaires</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">11 &#40;6&#8210;14&#46;25&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">0 &#40;0&#8210;4&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Sensory evaluation</span>&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">3 &#40;0&#8210;8&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">0 &#40;0&#8210;0&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">0&#46;001&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Total score</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">14 &#40;6&#8210;22&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0 &#40;0&#8210;5&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;000&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleBold">Neuropathy accompanying person&#44; n &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">27 &#40;53&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">8 &#40;17&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;000&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t" scope="col">Index of pain&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Pain questionnaires&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Sensory evaluation&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col">Total score&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">p&#47;rho&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">p&#47;rho&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">p&#47;rho&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">p&#47;rho&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">p&#47;rho&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
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          "en" => "<p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Correlation between disease duration&#44; attack frequency&#44; urticaria activity score&#44; finding of angioedema and neuropathy tests&#46;</p>"
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                      "doi" => "10.1385/CRIAI:30:1:019"
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                        "tituloSerie" => "Clin Rev Allergy Immunol"
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Journal Information
Vol. 98. Issue 3.
Pages 296-301 (1 May 2023)
Visits
4087
Vol. 98. Issue 3.
Pages 296-301 (1 May 2023)
Original Article
Full text access
Can chronic spontaneous urticaria produce symptoms of neuropathic pain?
Visits
4087
Gülhan Gürela,
Corresponding author
gulhanozturkgurel@hotmail.com

Corresponding author.
, Hikmet Saçmacıb
a Department of Dermatology, Faculty of Medicine, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
b Department of Neurology, Faculty of Medicine, Bozok University, Yozgat, Turkey
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Figures (1)
Tables (3)
Table 1. General demographic data and clinical features of the patient group.
Table 2. Evaluation of McGill pain scale short form questions and S-LANSS pain questionnaires in groups.
Table 3. Correlation between disease duration, attack frequency, urticaria activity score, finding of angioedema and neuropathy tests.
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Abstract
Background

Chronic spontaneous urticaria (CSU) is a condition that is associated with recurrent pruritic hives and/or angioedema lasting for more than 6 weeks and is known to affect 1% of the population. Neuropathic pain can be defined as abnormal pain in the peripheral or central nervous system following injury and results from dysfunctions in the peripheral or central nervous system without peripheral nociceptor stimulation. Histamine appears in the pathogenesis of both the CSU and diseases of the neuropathic pain spectrum.

Objective

To evaluate the symptoms of neuropathic pain in patients with CSU using scales.

Method

Fifty-one patients with CSU and 47 sex- and age-matched healthy controls were included in the study.

Results

The results of the short-form McGill Pain Questionnaire revealed the scores in the sensory and affective domains, Visual Analogue Scale (VAS) scores and pain indices to be significantly higher in the patient group (p < 0.05 for all cases), while the overall pain assessment and sensory assessment based on the Self-Administered Leeds Assessment of Neuropathic Symptoms and Signs (S-LANSS) pain scale were also significantly higher in the patient group. Based on the assumption that scores of > 12 indicated neuropathy, 27 (53%) of the patients in the patient group and 8 (17%) in the control group were found to have neuropathy (p < 0.05).

Study limitations

Cross-sectional study, small patient sample and use of self-reported scales.

Conclusion

In addition to itching, patients with CSU should be aware of the potential for the association of neuropathic pain. In this chronic disease that is known to affect the quality of life, using an integrated approach with the patients and identifying accompanying problems are as important as treating the dermatological disorder.

Keywords:
Chronic spontaneous urticarial
Neuropathic pain
Pruritus
Full Text
Introduction

Chronic spontaneous urticaria (CSU) is a condition that is associated with recurrent pruritic hives and/or angioedema lasting for more than 6 weeks, and is known to affect 1% of the population.1 Drugs, foods, food additives, infections (bacterial, viral, and fungal), parasitic infestations, allergens and malignancies have all been identified in the etiology of CSU, although the cause cannot be identified in 50% of cases.2,3 Vasoactive mediators released from dermal mast cells play a key role in the pathogenesis of CSU. Despite the presence of eicosanoids, cytokines and proteases, histamine is the major cytokine affecting the H1 (85%) and H2 receptors (15%) in the skin. The binding of histamine to H1 receptors causes pruritus (stimulation of C fibers) while binding to the receptors in capillaries leads to vasodilation, increased vascular permeability and edema.4

Neuropathic pain can be defined as abnormal pain in the peripheral or central nervous system following injury and results from dysfunctions in the peripheral or central nervous system without peripheral nociceptor stimulation.5 Neuropathic pain is a common problem in clinical practice and can be challenging to diagnose due to methodological differences in definition and assessment, although its estimated prevalence is 7%–10% in the general population.6 The mechanisms of pain formation are highly diverse and have yet to be fully clarified. Recent studies have reported that mast cells accumulate around nerve sheaths and play a role in the pathophysiology of neuropathic pain by secreting a wide variety of cytokines, including histamine.7

Histamine appears in the pathogenesis of both the CSU and neuropathic pain spectra of disorders. The present study investigates the symptoms of neuropathic pain in patients with CSU using scales, as the simplest and easiest method.

MethodStudy sample

This cross-sectional, questionnaire-based and case-controlled study was approved by the local ethics committee (Decree nº 2017-KAEK-189_2019.07.10_04) and was conducted in accordance with the principles of the Declaration of Helsinki.

After obtaining their informed consent, 51 patients with CSU and 47 sex- and age-matched healthy controls were included in the study. All of the participants were above the age of 18 years. Excluded from the study were those with pregnancy, lactation, alcohol consumption, presence of a major central nervous system disease, cognitive impairment and psychiatric comorbidity. Only CSU patients were included in the study. Patients with chronic inducible urticaria and acute urticaria were excluded.

The body weight and height measurements were obtained for the calculation of Body Mass Index (BMI), as well as sociodemographic data, disease duration, comorbid diseases, drug use, presence of angioedema and clinical examination results of patients with CSU presenting to dermatology outpatient clinics.

MeasurementsUrticaria Activity Score for 7 consecutive days (UAS7)

Is an established and widely accepted patient-reported outcome tool for the prospective measurement of CSU activity. UAS7 scores of ≤ 6 indicate well-controlled, 7–15 mild, 16–27 moderate and 28–42 severe urticarial.8

The short-form McGill Pain Questionnaire (SF-MPQ)

The main component of the SF-MPQ comprises 15 descriptors (11 sensory; 4 affective) that are rated on an intensity scale of 0 = none, 1 = mild, 2 = moderate or 3 = severe, and three pain scores are derived from the sum of the intensity rank values of the words chosen for sensory, affective and total descriptors. The SF-MPQ also includes the Present Pain Intensity index of the standard MPQ and a Visual Analogue Scale (VAS).9

The Self-Administered Leeds Assessment of Neuropathic Symptoms and Signs (S-LANSS) Questionnaire

Aims to identify the pain of predominantly neuropathic origin, distinct from nociceptive pain, without the need for clinical examination. The S-LANSS is a 5-item questionnaire related to symptoms of pain and with two items related to clinical signs involving self-administered sensory tests for the presence of allodynia and decreased pin-prick sensation. The scores range from 0 to 24, with a score of 12 or greater suggesting neuropathic pain. 10

The validity and reliability of the Turkish version of these scales were developed.

Data analysis

All statistical analyses were performed using the IBM SPSS Statistics (Version 20.0. Armonk, NY: IBM Corp.) software package program. Continuous variables were expressed as mean ± SD, and Student’s t-tests were used to compare the means between the two groups. For categorical variables, a Chi-Square test was used to test the differences between groups. Spearman’s correlation analysis was used for the correlation between neuropathy tests and disease characteristics. Unless otherwise stated, p < 0.05 was set as the level of significance.

Results

The study included 51 patients (36 females, 15 males) and 47 controls (27 females, 20 males), and the two groups had similar sociodemographic characteristics (p < 0.05). In the patient group, 18 were on omalizumab and 18 were on antihistamines, while the remainder were not receiving treatment at the time of admission (Table 1).

Table 1.

General demographic data and clinical features of the patient group.

  Patients (n = 51)  Controls (n = 47) 
Gender (Ratio of Female/Male)  36/15  27/20  0.208 
Age (median 25–75pr)  41 (29‒53)  39 (31‒53)  0.862 
BMI (median 25–75pr)  26.72 (23.50‒31.25)  26.12 (23.23‒30.81)  0.644 
Education status, n (%)      0.506 
Primary school  18 (35.3%)  11(23.4%)   
Secondary school  4 (7.8%)  4 (8.5%)   
High school  10 (19.6%)  8 (17%)   
University  19 (37.3%)  24 (50%)   
Additional disease, n (%)      0.982 
Hypertension  5 (9.8%)  4 (8.5%)   
Diabetes mellitus  6 (11.8%)  5 (10.6%)   
Guatr  8 (15.7%)  6 (12.8%)   
Others  3 (5.9%)  2 (4.3%)   
Disease duration (years)  3 (1‒9)  ‒  ‒ 
Urticaria activity score (median 25–75pr)  28 (14‒28)  ‒  ‒ 
Finding of angioedema (n)  20 patients  ‒  ‒ 
Therapy of urticeria       
None  15 (29.4%) 
Antihistaminic  18 (35.3%) 
Omalizumab  18 (35.3%) 

BMI, Body Mass Index; p < 0.05 statistically significant.

The findings were given as median and interquartile range (25p‒75p).

An assessment of the results of the short-form McGill Pain Questionnaire revealed the scores in the sensory and affective domains, VAS scores and pain indices to be significantly higher in the patient group (p < 0.05 for all cases), while the overall pain assessment and sensory assessment based on the S-LANSS pain scale were also significantly higher in the patient group. Based on the assumption that scores of > 12 indicated neuropathy, 27 (53%) of the patients in the patient group and 8 (17%) in the control group were found to have neuropathy (p < 0.05). An analysis of the results of the questionnaire revealed the median total neuropathy score in the patient group to be 14, which was statistically compatible with the neuropathy findings (range: 0–33) (Table 2).

Table 2.

Evaluation of McGill pain scale short form questions and S-LANSS pain questionnaires in groups.

  Patients (n = 51)  Controls (n = 47) 
McGill pain questionnaires       
Sensory score  7 (3.75‒16.5)  0 (0‒3)  0.000 
Perceptual score  2 (0‒6)  0 (0‒1)  0.000 
Index of pain  11 (6‒14.25)  0 (0‒4)  0.000 
VAS  0 (0‒6)  0 (0‒3)  0.001 
S-LANSS pain questionnaires       
Pain questionnaires  11 (6‒14.25)  0 (0‒4)  0.000 
Sensory evaluation  3 (0‒8)  0 (0‒0)  0.001 
Total score  14 (6‒22)  0 (0‒5)  0.000 
Neuropathy accompanying person, n (%)  27 (53%)  8 (17%)  0.000 

VAS, Visual Analog Scale. The findings were given as median and interquartile range (25p‒75p).

An analysis of the correlations between the disease activation findings (duration of disease, frequency of attacks, urticaria activity score, and presence of angioedema) and neuropathy revealed a statistically strong positive correlation, especially with the urticaria activity score (p < 0.001, rho range: 0.524–0.969) (Table 3).

Table 3.

Correlation between disease duration, attack frequency, urticaria activity score, finding of angioedema and neuropathy tests.

  Sensory score  Perceptual score  Index of pain  VAS  Pain questionnaires  Sensory evaluation  Total score 
  p/rho  p/rho  p/rho  p/rho  p/rho  p/rho  p/rho 
Disease duration0.335  0.174  0.656‒0.0650.464  0.656‒0.0650.798‒0.0370.738‒0.048
0.139  0.195  0.105 
Attack frequency0.510  0.596  0.300  0.990‒0.0020.300  0.842  0.468 
0.095  0.077  0.150  0.150  0.029  0.105 
Urticaria activity score0.000  0.000  0.000  0.000  0.000  0.000  0.000 
0.572  0.524  0.969  0.533  0.969  0.894  0.523 
Finding of angioedema0.293  0.307  0.097  0.992  0.097  0.293  0.222 
0.152  0.147  0.238  0.001  0.238  0.152  0.121 

Spearman's correlation analysis.

Fig. 1 presents a bar chart of the patient and control group symptoms according to the McGill Questionnaire items. As can be seen from the chart, the descriptors that were statistically strongly significant were aching, heavy, hurtful, gnawing and hot burning (p < 0.001 for all). As for the affective domain, the strongest significant descriptors were tiring-exhausting (p < 0.001), sickening and fearful (p = 0.001), while others were throbbing (p = 0.195), shooting (p = 0.591), stabbing (p = 0.041), sharp (p = 0.042), cramping (p = 0.591), splitting (p = 0.090) and punishing-cruel (p = 0.018).

Figure 1.

Bar graphs of the findings according to Mcgill Pain Questionnaires in the groups.

(0.18MB).
Discussion

In the present study significantly, higher scores were identified in the sensory and affective domains of the short-form McGill Pain Questionnaire, as well as the VAS scores and pain indices in the patient group. The overall pain assessments and sensory assessments identified from the S-LANSS pain scale were also significantly higher in the patient group. Neuropathy was detected in 27 and eight of the patient and control groups, respectively. There was a statistically strong positive correlation between the urticaria activity score, and the neuropathy test scores.

Neuropathic pain is a common problem in clinical practice that affects many aspects of daily life, and that is associated with poor overall health, reduced quality of life, poor sleep, and higher levels of anxiety and depression. The quality-of-life measurements of those with chronic neuropathic pain were found to be as low as in those with depression, coronary artery disease, recent myocardial infarction or uncontrolled diabetes mellitus.11

Mast cells are immunological cells that are distributed throughout different parts of the body with reported roles in several pathological conditions, such as hypersensitivity, atherosclerosis, pulmonary hypertension and infertility. There have also been studies reporting the importance of their roles in the pathogenesis of neuropathic pain of various etiologies7 Olsson12 first reported the role of mast cells in neuropathic pain and demonstrated the degranulation of mast cells in epineurium, perineurium and endoneurial connective tissue in response to trauma. Subsequent studies have revealed the role of increased mast cells in the regions surrounding the nerves and their mediators (primarily histamine and 5-HT) in the etiology of neuropathic pain.13–15 Considering the pathogenesis of CSU, it seems likely to be mainly a mast cell-derived disease. Cytokines such as histamine and platelet-activating factor, tryptase and leukotrienes released from mast cells cause sensory nerve activation, vasodilation and plasma extravasation.16 As can be seen, mast cells appear in the etiopathogenesis of diseases such as CSU and neuropathic pain. It was hypothesized in the present study that neuropathic pain-related symptoms may be more common in patients with CSU. To the best of our knowledge, however, there has been no study addressing this subject in literature to date. Consequently, the present study is the first to evaluate the relationship between CSU and symptoms of neuropathy.

It has been well established that sensitized mast cells can cause allergies and anaphylaxis, and mast cells are also known to contribute to several biological and pathological processes, such as vascular physiology, pain, itching and cancer.17–19 Among the previous studies in the literature evaluating the relationship between dermatological diseases and symptoms of neuropathy, Di Carlo et al. examined 118 psoriatic arthritis patients and applied questionnaires through which they detected symptoms of neuropathy in 25.4% of the patients.20 Garcovich et al. evaluated the neuropathic pain symptoms of 110 patients with hidradenitis suppurativa using questionnaires, and classified 33 (30%) of the 110 patients as having “likely neuropathic pain”, 32 (29.1%) with “possible neuropathic pain” and 45 (40.9%) with “unlikely neuropathic pain”. The pain and itching scores were found to be correlated, and the patients reported that their daily activities were significantly impaired due to pain. The authors emphasized the complex and multifactorial factors determining the pain phenotype in hidradenitis suppurativa.21 Eosinophilic perineural inflammation and abnormal mast cell innervation were demonstrated in the histopathology of the lesional and perilesional skin of patients with hidradenitis suppurativa, suggesting a potential anatomical correlate of “neuropathic” pain.22 Lipoxygenase-derived inflammatory mediators, eicosanoids and leukotriene B4 are increased in lesional skin, and are known to be inducers of peripheral inflammation and hyperalgesia.23 In light of this information, it is no surprise that patients with hidradenitis suppurativa tend to have accompanying symptoms of neuropathic pain.

Atopic dermatitis presents with severe itching, similar to CSU, and recent studies have reported accompanying pain symptoms in addition to itching in patients with atopic dermatitis, identifying a need to question patients in this regard.24–26 Pain was commonly described as “burning” and “stinging” by patients with atopic dermatitis26 who described their experience of itching as painful, throbbing, biting, stinging, burning, sharp, tingling, pinprick-like, and/or associated with crawling sensations.24,25 All these clinical characteristics support the partial (but not fully) neuropathic component of itching.

Wallis et al. examined 35 patients with pachyonychia congenital – a rare autosomal dominant disorder – and assessed the severity and type of pain, as the main symptom in these patients, through questionnaires and quantitative sensory tests. The authors reported that 62% of the patients had neuropathic pain and the rest had nociceptive pain symptoms.27 Similarly, Brill et al. made a recent study of the origin of pain in patients with pachyonychia congenital in which 62 patients and 45 controls applied the McGill and Douleur Neuropathique-4 questionnaires and underwent sensory tests. The authors found that pain may be of neuropathic origin and suggested that patients could benefit from neuropathy-oriented treatments.28

This study has some limitations, the main ones being its cross-sectional study design, the small patient sample and the use of self-reported scales. Comorbidities such as type 2 diabetes could be associated with neuropathic pain, but these were present in only a small proportion of the sample, and there was no difference in the comorbidities of the two groups. Furthermore, no electrophysiological screening tests could be performed, as a further limitation. The questionnaires applied can be considered valid and reliable for use in screening tests, and in some cases, they may help identify disorders that cannot be detected by electrophysiology.

Conclusion

In addition to itching, patients with CSU should be aware of the potential for accompanying neuropathic pain. In this chronic disease that is known to affect the quality of life, using an integrated approach with the patients and identifying accompanying problems are as important as treating the dermatological disorder. There is a need for prospective studies of this issue in which descriptive and methodological methods are applied together in large patient series to support the findings of the present study.

Financial support

None declared.

Authors’ contributions

Gülhan Gürel - Designed the study; recruited the participants; participated in the data collection; interpreted the data; drafted the first manuscript and all authors critically reviewed the paper.

Hikmet Saçmacı - Designed the study; participated in the data collection; did the statistical analysis; interpreted the data.

Conflicts of interest

None declared.

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Study conducted at the Faculty of Medicine, Bozok University, Yozgat, Turkey.

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