Myotonic Discharge
A characteristic electromyographic finding where muscle fibers fire repetitively after stimulation, producing a distinctive 'dive bomber' sound on audio monitoring.
Full Definition
Myotonic discharge is an abnormal electromyographic pattern observed in muscle disorders affecting membrane excitability. The discharge consists of repetitive action potentials that wax and wane in both amplitude and frequency, creating a characteristic audio signature resembling a dive bomber or motorcycle engine. This finding is pathognomonic for myotonic disorders and represents delayed relaxation of muscle fibers after contraction or mechanical stimulation. Editors must distinguish this from other repetitive discharges in EMG reports.
Usage
Usage note: Always hyphenate when used as a compound modifier.
In Context
- "The EMG revealed classic myotonic discharges in the thenar muscles." — Electrodiagnostic report
- "Myotonic discharges were absent despite clinical myotonia." — Case presentation