Table 5.
Electrodiagnostic characteristics based on the time of study in patients with Guillain-Barre syndrome
| Nerve |
Early
a
, < 2 weeks
|
Late
a
, ≥ 2 weeks
|
||||
|---|---|---|---|---|---|---|
| AIDP, n = 15 | AMAN, n = 8 | AMSAN, n = 2 | AIDP, n = 29 | AMAN, n = 8 | AMSAN, n = 8 | |
| CB, f (%) | 6 (40.0) | 1 (12.5) | 0 | 14 (48.3) | 0 | 0 |
| TD, f (%) | 5 (33.3) | 0 | 0 | 14 (48.3) | 0 | 0 |
| Absent F-wave, f (%) | 3 (20.0) | 1 (12.5) | 0 | 5 (17.2) | 2 (25.0) | 0 |
| Prolonged F-wave, f (%) | 6 (40.0) | 0 | 0 | 10 (34.5) | 0 | 0 |
| F-wave persistency %, Median (range) |
15 (0-60) | 70 (0-90) | 50 (50-50) | 40 (0-100) | 80 (0-100) | 80 (60-90) |
| Unobtainable H reflex, f (%) | 12 (80.0) | 2 (25.0) | 0 | 11 (37.9) | 5 (62.5) | 2 (25.0) |
| Sural sparing | 5 (33.3) | 0 | 0 | 11 (37.9) | 0 | 5 (62.5) |
AIDP: Acute inflammatory demyelinating polyneuropathy
AMAN: Acute motor axonal polyneuropathy; AMSAN: Acute motor sensory axonal polyneuropathy; CB: Conduction block
TD: Temporal dispersion
a
Time of nerve conduction study from onset of symptoms.