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Abstract Title:

Rapsyn congenital myasthenic syndrome worsened by fluoxetine.

Abstract Source:

Muscle Nerve. 2016 Jul 11. Epub 2016 Jul 11. PMID: 27397848

Abstract Author(s):

Amy C Visser, Ruple S Laughlin, William J Litchy, Eduardo E Benarroch, Margherita Milone

Article Affiliation:

Amy C Visser

Abstract:

INTRODUCTION: Fluoxetine is a selective serotonin reuptake inhibitor and long-lived open channel blocker of the acetylcholine receptor, often used in the treatment of slow-channel congenital myasthenic syndromes (CMS).

METHODS: We report a 42-year-old woman who had a history of episodic limb weakness that worsened after initiation of fluoxetine for treatment of depression. Genetic testing for CMS revealed a homozygous pathogenic mutation in the rapsyn (RAPSN) gene (p.Asn88Lys). Electrodiagnostic testing was performed before and 1 month after discontinuation of fluoxetine.

RESULTS: The 2 Hz repetitive nerve stimulation of the fibular and spinal accessory nerves showed a baseline decrement of 36% and 14%, respectively. One month after discontinuing fluoxetine, the spinal accessory nerve decrement was no longer present, and the decrement in the fibular nerve was improved at 17%.

CONCLUSIONS: This case demonstrates worsening of both clinical and electrophysiologic findings in a patient with CMS secondary to a RAPSN mutation treated with fluoxetine. Muscle Nerve, 2016.

Study Type : Human: Case Report

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