Table 2.
Description of electrodiagnostic studies from 10 reported cases of Guillain Barre syndrome associated with SARS- COV-2 infection.
| Timing of electrodiagnostic studies from onset of neurological symptoms | Electrodiagnostic studies | Interpretation | Follow up electrodiagnostic studies | References |
|---|---|---|---|---|
| Day 4 | 1. Absence of both the sural nerve sensory nerve action potential (SNAP) and the tibial nerve compound muscle action potential (CMAP). 2. Markedly increased common peroneal CMAP distal latency, markedly decreased velocity, moderately decreased CMAP amplitude (with spatial and temporal dispersion) for the same nerve. 3. Decreased ulnar SNAP amplitude. |
Acute polyradiculoneuritis, confirmed demyelination | None, Patient died unfortunately. | (8) |
| Day 5 | 1. Decreased right median, and bilateral ulnar velocities and increased F wave latencies in same nerves 2. Increased distal latencies and decreased velocities along bilateral peroneal and tibial nerves. |
Acute inflammatory demyelinating polyneuropathy. | Unavailable | (9) |
| Day 5 | 1. Sensorimotor demyelinating polyneuropathy with sural sparing pattern. 2. F wave study showed decreased persistence or absent F-waves in tested nerves. |
Acute inflammatory demyelinating polyneuropathy. | Unavailable | (10) |
| Day 5 | 1. Increased left median distal latencies. 2. Increased left ulnar distal latencies and absent F waves 3. Increased bilateral tibial distal latencies and absent F waves |
Acute inflammatory demyelinating polyneuropathy. | Unavailable | (12) |
| Day 9 | 1.Absent SNAP, Decreased CMAP amplitude along bilateral tibial and median nerves | Acute sensory motor axonal neuropathy | Unavailable | (13) |
| Day 3 | 1.Decreased ulnar SNAP, decreased tibial and ulnar CMAP. 2. Absent ulnar and tibial F waves. |
Acute sensory motor axonal neuropathy | Unavailable | (14) |
| Day 12 | 1. Decreased ulnar SNAP, decreased tibial and ulnar CMAP. 2.Decrease in facial nerve cMAP amplitude. 3. Absent tibial F waves |
Acute sensory motor axonal neuropathy | Unavailable | (14) |
| Day 11 | 1.Decreased ulnar and tibial CMAP 2. Absent ulnar and tibial F waves |
Acute motor axonal neuropathy | Unavailable | (14) |
| Day 2 | 1. Increased tibial latencies, decreased CMAP amplitude, decreased velocities. 2. Decreased ulnar amplitude. |
Acute inflammatory demyelinating polyneuropathy. | Unavailable | (14) |
| Day 4 | 1. Increased tibial latencies, decreased CMAP amplitude, decreased velocities, conduction block. 2. Decreased sural SNAP, absent tibial F waves |
Acute inflammatory demyelinating polyneuropathy. | Unavailable | (14) |