Electrophysiological findings
| Findings | n (%) | |
|---|---|---|
| Nerve conduction: | ||
| Reduced CMAP | 5 (25%) | |
| Slow motor and sensory conduction velocity | 2 (10%) | |
| EMG: | ||
| Fasciculations | 8 (40%) | |
| Fibrillations/Positive sharp waves | 17 (85%) | |
| Myokymia | 1 (5%) | |
| Complex repetitive discharges | 4 (20%) | |
| Quantitative EMG in 13 patients: | ||
| Increased polyphasics (15-60%) | 11 (85%) | |
| Short mean duration - all MUPs ( 26-48%) | 10 (77%) | |
| Short mean duration - simple MUPs (34-46%) | 13 (100%) | |
| Quantitative EMG and diagnosis of myopathy: | ||
| qEMG done | qEMG not done | |
| Diagnosis of myopathy | 13 | 1 |
| No diagnosis of myopathy | 0 | 7 |