TABLE 4.
Electrodiagnostic findings in Miller–Fisher syndrome patients: percentage of patients with abnormal results in at least two nerves
| Finding | Very early, % (n) | Early, % (n) | Overall, % (n) |
|---|---|---|---|
| H reflex absence | 100% | 100% | 100% |
| F wave anomalies | 33% | 20% | 25% |
| Reduced CMAP A | 33% | 20% | 25% |
| Reduced MCV | 0% | 40% | 25% |
| Increased DML | 0% | 0% | 0% |
| Increased CMAP Dur | 0% | 20% | 12% |
| Conduction blocks | 0% | 0% | 0% |
| Reduced SNAP A | 33% | 80% | 63% |
| Reduced SCV | 0% | 33% (3) | 17% (6) |
| Sural‐sparing pattern | 33% | 75% (4) | 57% (7) |
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.