TABLE 3.
Electrodiagnostic findings in Guillain–Barré syndrome patients: percentage of patients with abnormal results in at least two nerves
| Finding | Very early, % (n) | Early, % (n) | Overall, % (n) |
|---|---|---|---|
| H reflex absence | 73% | 92% | 82% |
| F wave anomalies | 67% | 61% | 64% |
| Reduced CMAP A | 60% | 31% | 46% |
| Reduced MCV | 23% (13) | 33% (12) | 28% (25) |
| Increased DML | 46% (13) | 50% (12) | 48% (25) |
| Increased CMAP Dur | 31% (13) | 33% (12) | 32% (25) |
| Conduction blocks | 15% (13) | 33% (12) | 24% (25) |
| Reduced SNAP A | 40% | 31% | 36% |
| Reduced SCV | 0% (13) | 16% (12) | 8% (25) |
| Sural‐sparing pattern | 25% (11) | 18% (12) | 21% (23) |
When patients were excluded due to the lack of CMAPs, SNAPs, or normal sural nerve SNAPs, frequencies are calculated based on the number of patients reported in parentheses.
Abbreviations: CMAP A, compound motor action potential amplitude; CMAP Dur, compound motor action potential duration; DML, distal motor latency; MCV, motor conduction velocity; SCV, sensory conduction velocity; SNAP A, sensory nerve action potential amplitude.