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Continuous muscle fiber activity syndrome

M Calişkan1, D Türkdogan, M Ozmen

  • 1Department of Pediatrics, Faculty of Medicine, Istanbul University, Turkey.

Acta Paediatrica Japonica : Overseas Edition
|February 1, 1995
PubMed
Summary

Continuous muscle fiber activity syndrome (CMFAS) causes progressive muscle stiffness. Electromyography confirmed continuous motor neuron activity, which was reduced by anesthesia and nerve blocks.

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Area of Science:

  • Neurology
  • Clinical Electrophysiology

Background:

  • Continuous muscle fiber activity syndrome (CMFAS) is a rare neuromuscular disorder characterized by persistent muscle stiffness and activity.
  • Understanding the electrophysiological characteristics and response to interventions is crucial for diagnosis and management.

Observation:

  • A 5.5-year-old Turkish boy presented with progressive muscle stiffness.
  • Electromyography (EMG) revealed continuous motor neuron activity at rest.
  • This activity was also observed after intravenous diazepam administration.

Findings:

  • Peripheral nerve block, spinal anesthesia, and general anesthesia all diminished the spontaneous muscle activities.
  • Comparison with existing literature highlights the heterogeneous clinical and electrophysiological presentation of CMFAS.

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Implications:

  • This case contributes to the understanding of CMFAS heterogeneity.
  • The findings underscore the utility of electrophysiological studies and anesthetic interventions in diagnosing and managing CMFAS.