Neuropathic Pain and Its Relationship with Clinical Findings in Patients with Fibromyalgia

Abstract

Introduction: Fibromyalgia syndrome (FMS) is a clinical condition characterised by chronic generalised body pain, fatigue and presence of tender points. In this study, we hypothesized that FMS could be a type of neuropathic pain and investigated the relationship between neuropathic pain and sleep disturbance and depression. We also investigated the association between these clinical conditions and disease severity.

Methods: Seventy-six patients who had FMS diagnosis according to 2010 ACR criteria were included in the study. Patients were evaluated by Fibromyalgia Impact Questionnaire (FIQ), Hamilton Depression Rating Scale (HAM-D), Pittsburgh Sleep Quality Index (PSQI), Douleur Neuropathique 4 Questions (DN4) and Leeds Assessment of Neuropathic Symptoms and Signs (LANSS).

Results: Patients had neuropathic pain in 92.1% of patients with LANSS and 82.9% of patients with DN4. According to the Pittsburg Sleep Quality Scale, 90.8% of patients had poor sleep quality. According to HAM-D, 82.9% of the patients had depression. The mean FIQ values of the patients were calculated as 63.16±10.73. There was a positive correlation between DN4 values and FIQ, PSQI, HAM-D and LANSS. There was a positive correlation between LANSS values and FIQ and PSQI values.

Conclusion: In this study we found the frequency of neuropathic pain high in FMS. We also found a positive association between neuropathic pain scales and depression, sleep disturbance, and fibromyalgia impact score. Pain, functionality and psychosocial characteristics should be assessed extensively to understand fibromyalgia completely. Abnormal pain process and secondary clinical conditions should be considered together.

Keywords: Depression; fibromyalgia; neuropathic pain; sleep disturbance.