Neuropathic pain features suggestive of small fibre neuropathy in fibromyalgia syndrome: a clinical and ultrasonographic study on female patients.

Objectives: To evaluate the performance of two screening tools, respectively Pain Detect Questionnaire (PDQ) and Douleur Neuropathique 4 questions (DN4), and the optimal cut-off point of the sural nerve cross-sectional area (CSA), in identifying the neuropathic pain features suggestive of a small fiber neuropathy (SFN), in patients with fibromyalgia syndrome (FM).

Methods: Consecutive adult female FM patients fulfilling the American College of Rheumatology (ACR) 2016 criteria have been enrolled. Patients underwent a clinical assessment and ultrasound examination of the sural nerve CSA.

Sural Nerve Size in Fibromyalgia Syndrome: Study on Variables Associated With Cross-Sectional Area.

Increased cross-sectional area (CSA) of sural nerve, documented by ultrasound (US), has been revealed in small fibers neuropathy, condition present in about half of patients with fibromyalgia (FM). The aims of this study were to evaluate sural nerve CSA and to establish the variables associated with increased CSA in FM patients. A cross-sectional assessment was conducted in consecutive FM patients.