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Repetitive nerve stimulation test in myasthenic crisis.

INTRODUCTION: Herein we report our experience with the repetitive nerve stimulation (RNS) test in myasthenia gravis (MG) crisis.

METHODS: The various parameters of the RNS tests in 26 patients with MG crisis were analyzed.

RESULTS: In 18 (69%) patients, MG crisis is the first manifestation of MG. RNS tests were abnormal in 24 (92%) patients by decrement at low-rate stimulation in any of 4 tested muscles. Three patterns of abnormality were found: MG pattern (decrement at low-rate stimulation) in 23 patients; Lambert-Eaton myasthenic syndrome pattern in 1 patient; and cholinergic crisis pattern in 1 patient.

DISCUSSION: During MG crisis, the RNS test can serve as a rapid and sensitive diagnostic tool for MG in a majority of patients. Muscle Nerve 59:544-544, 2019.

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