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CLINICAL PHENOTYPING FOR PAIN MECHANISMS IN UROLOGIC CHRONIC PELVIC PAIN SYNDROMES: A MAPP RESEARCH NETWORK STUDY
Journal article   Open access   Peer reviewed

CLINICAL PHENOTYPING FOR PAIN MECHANISMS IN UROLOGIC CHRONIC PELVIC PAIN SYNDROMES: A MAPP RESEARCH NETWORK STUDY

Andrew Schrepf, Robert Gallop, Bruce Naliboff, Steven E. Harte, Niloofar Afari, H. Henry Lai, Michel Pontari, Lindsey C. McKernan, Eric Strachan, Karl J. Kreder, …
The journal of pain, Vol.23(9), pp.1594-1603
09/01/2022
DOI: 10.1016/j.jpain.2022.03.240
PMCID: PMC10547025
PMID: 35472518
url
https://doi.org/10.1016/j.jpain.2022.03.240View
Published (Version of record) Open Access

Abstract

•Three recognized pain mechanisms are present in Urologic Pelvic Pain Syndrome•Different patterns of clinical presentation and treatment utilization are apparent Perspective: This article presents differences in clinical characteristics based on a simple self-report method of classifying pain mechanisms for Urologic Chronic Pelvic Pain Syndrome patients. This method can be easily applied to other chronic pain conditions and may be useful for exploring pathophysiology in pain subtypes. Disclosures: Funding for the MAPP Research Network was obtained under a cooperative agreement from National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institutes of Health (NIH) [DK082315 (Andriole, G; Lai, H), DK082316 (Landis, J), DK082325 (Buchwald, D), DK082333 (Lucia, M), DK082342 (Klumpp, D; Schaeffer A), DK082344 (Kreder, K), DK082345 (Clauw, D; Clemens, JQ), DK082370 (Mayer, E; Rodriguez L), DK103227 (Moses, M), DK103260 (Anger, J; Freeman, M), DK103271 (Nickel, J)]. Three categories of pain mechanisms are recognized as contributing to pain perception: nociceptive, neuropathic, and nociplastic (i.e., central nervous system augmented pain processing). We use validated questionnaires to identify pain mechanisms in Urologic Chronic Pelvic Pain Syndrome (UCCPS) patients (n=568, female=378, male= 190) taking part in the Symptom Patterns Study of the Multidisciplinary Approach to the study of chronic Pelvic Pain Research Network. A cutoff score of 12 on the painDETECT questionnaire (-1-38) was used to classify patients into the neuropathic category while the median score of 7 on the fibromyalgia survey criteria (0-31) was used to classify patients into the nociplastic category. Categories were compared on demographic, clinical, psychosocial, psychophysical and medication variables. At baseline, 43% of UCPPS patients were classified as nociceptive-only, 8% as neuropathic only, 27% as nociceptive+nociplastic, and 22% as neuropathic+nociplastic. Across outcomes nociceptive-only patients had the least severe symptoms and neuropathic+nociplastic patients the most severe. Neuropathic pain was associated with genital pain/sensitivity on pelvic exam, while nociplastic pain was associated with comorbid pain conditions, psychosocial difficulties, and increased pressure pain sensitivity outside the pelvis. A self-report method classifying individuals on pain mechanisms reveals clinical differences that could inform clinical trials and novel targets for treatment.
central nervous system sensitization chronic pain cystitis, interstitial neuropathic pain nociceptive pain prostatitis

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