Brody myopathy demonstrates a pseudo-increment on repetitive nerve stimulation.
Muscle Nerve
; 61(4): 491-495, 2020 04.
Article
en En
| MEDLINE
| ID: mdl-31944327
ABSTRACT
INTRODUCTION:
Brody myopathy (BM) is a recessive condition caused by mutations in the ATP2A1 gene and usually induces impaired muscle relaxation during and after exercise. Diagnosis relies on needle electromyography showing electrical silence, muscle biopsy with decreased sarcoplasmic reticulum calcium adenosine triphosphatase activity, and genetic analysis. Electrodiagnostic functional analyses are useful in the diagnosis of channelopathies, and thus may be impaired in BM.METHODS:
We performed exercise tests and repetitive nerve stimulation (RNS; 10 supramaximal stimuli at 3 Hz) in 10 patients with BM.RESULTS:
All participants showed incremental responses on RNS. Compound muscle action potential amplitude was increased and duration was decreased, especially in the ulnar nerve (+30.2 ± 7.1% and - 30.3 ± 2.8%, respectively; both P < .001).DISCUSSION:
Easily accessible, this sign, referred to as the Arzel sign, could prove to be a very useful tool in BM diagnosis and in broadening its phenotype.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Nervio Cubital
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Potenciales de Acción
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Músculo Esquelético
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Electrodiagnóstico
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Miotonía Congénita
Límite:
Female
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Humans
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Male
Idioma:
En
Año:
2020
Tipo del documento:
Article