Erythromelalgia-like presentation of chronic acquired demyelinating polyneuropathy in a setting of past alcohol abuse

Neuromuscular Disorders : NMD
Miguel Chuquilin, Upinder K Dhand

Abstract

Erythromelalgia may be primary or secondary to an underlying medical condition. Association with small fiber neuropathy and axonal large fiber peripheral neuropathy has been described. Erythromelalgia in the setting of acquired demyelinating neuropathy has not been reported. We report a 52-year-old woman with severe erythromelalgia, pain and burning, progressive weakness, hyporeflexia and distal pan-sensory deficits. Cerebrospinal fluid protein was 219 mg/dL. Nerve conduction study revealed extreme (ten-fold) prolongation of distal motor latencies, markedly slow motor nerve conduction, reduced terminal latency index, reduced distal compound muscle action potential (CMAP) amplitude, possible conduction blocks, and distal denervation. Treatment with intravenous immunoglobulin, prednisone and azathioprine resulted in marked clinical and electrophysiological improvement. Our patient fulfills the diagnostic criteria for chronic inflammatory demyelinating polyneuropathy (CIDP); however, the unique electrodiagnostic features and presentation with erythromelalgia may represent a CIDP variant or a novel dysimmune neuropathy, or may partly be related to neurotoxic effects of prior alcohol abuse.

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