Enhanced Itch Intensity Is Associated with Less Efficient Descending Inhibition Processing for Itch But Not Pain Attenuation in Chronic Dermatology Patients
| Autor: | Sarit Yakov, Michal Granot, Michal Ramon |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Pain Threshold
medicine.medical_specialty Clinical pain Pain Dermatology 030207 dermatology & venereal diseases 03 medical and health sciences 0302 clinical medicine Disease severity Noxious stimulus Medicine Humans Brief Pain Inventory business.industry Pruritus General Medicine Intensity (physics) Anesthesiology and Pain Medicine Nociception Cross-Sectional Studies Conditioned pain modulation Dermatology clinic Neurology (clinical) business 030217 neurology & neurosurgery |
| Zdroj: | Pain medicine (Malden, Mass.). 21(10) |
| ISSN: | 1526-4637 |
| Popis: | Objectives The study aims were 1) to investigate the direction of mutual inhibitory pathways on itch intensity by utilizing conditioned pain modulation paradigms for pain and itch attenuation and 2) to explore whether itch severity is affected by the individual pain sensitivity profile, as well as pain scores reported during the tests and the past week. Design Cross-sectional. Setting Testing was conducted at the Department of Dermatology, Rambam Health Care Campus. Subjects Forty patients suffering from chronic skin disorders associated with itch and treated in the Dermatology Clinic at Rambam Health Care Campus participated in the study. Methods Efficacy of descending inhibition was evaluated by two conditioned pain modulation (CPM) paradigms: by pruriception (CPMItch) induced by cold and heat as counterstimuli to inhibit itch intensity and by nociception (CPMPain). Severity and interference of clinical pain were assessed using the Brief Pain Inventory (BPI). Results Robust CPMItch responses were obtained following the various noxious stimulations. No associations were observed between CPMPain and CPMItch, itch severity, skin disease severity, and clinical pain symptoms. According to the linear regression model, itch severity was independently associated with less efficient CPMItch (B = –0.750, P Conclusions Findings indicate that the intrinsic capacity to inhibit pain and itch by exposure to exogenous noxious stimuli autonomously affects itch intensity in an opposing manner. These findings may shed new light on the mutual mechanistic similarity and dissimilarity between pain and itch and their hierarchy. |
| Databáze: | OpenAIRE |
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