repetitive discharge
Abnormal EMG findings characterized by repeated firing of the same muscle fiber or motor unit, often indicating neuromuscular junction disorders.
Full Definition
Repetitive discharges are abnormal EMG patterns where muscle fibers or motor units fire repeatedly after a single stimulus or voluntary activation. These include phenomena such as doublets, triplets, or longer trains of identical potentials. Repetitive discharges can occur in various conditions including myotonia, neuromuscular junction disorders like myasthenia gravis, and certain muscle diseases. The pattern and frequency of repetitive discharges help differentiate between conditions: high-frequency discharges suggest myotonia, while variable repetitive firing may indicate neuromuscular junction dysfunction. Clinical editors should ensure that descriptions of repetitive discharges include frequency characteristics and triggering factors for accurate diagnostic interpretation.
Usage
Usage note: Describe frequency and triggering factors to aid in differential diagnosis.
In Context
- "Repetitive discharges were triggered by needle movement, consistent with myotonic disorder." — EMG report
- "Post-activation repetitive discharges suggested neuromuscular junction pathology." — Electrodiagnostic study