Neurophysiological measurements in myasthenia gravis and Lambert-Eaton myasthenic syndrome
| MG | LEMS | |
|---|---|---|
| CMAP, compound muscle action potential; LEMS, Lambert-Eaton myasthenic syndrome; MG, myasthenia gravis; RNS, repetitive nerve stimulation; SFEMG, single fibre electromyography. | ||
| CMAP amplitude (resting) | Normal | Reduced |
| CMAP amplitude (immediately post exercise) | Normal | Increased |
| RNS at 3 Hz (resting) | Decrement | Decrement |
| RNS at 3 Hz (immediately post-exercise) | Normal | Normal |
| RNS at 3 Hz (2 min after exercise) | Enhanced decrement | Decrement |
| SFEMG or stimulated SFEMG | Jitter | Jitter |
| Stimulated SFEMG at 3 Hz | Jitter | Increased jitter |
| Stimulated SFEMG at 10 Hz | Increased jitter | Reduced jitter |