- •The effect of nerve conduction study timing is uncertain in Guillain–Barré syndrome.
- •This study compares early versus late electrophysiology using 2 sets of criteria.
- •No differences in subtype proportions were found with early compared to late studies.
- •Use of either sets of criteria produced similar comparative results as regards timing.
The effect of timing is uncertain on the electrophysiology of Guillain–Barré syndrome (GBS). On this may however depend the usefulness of systematic serial studies performed at specific time intervals. We retrospectively analyzed records of 118 consecutive patients with GBS from Birmingham, U.K. (2001–2012), studied between 0–14 days, or, 15–42 days post-onset using new criteria which we recently proposed . Rates of acute inflammatory demyelinating polyneuropathy (AIDP) (p = 0.45), axonal GBS (p = 0.32) and equivocal forms (p = 0.46) were similar for both timings. Similarly, no significant differences between timings were observed using Hadden et al.'s criteria. Proportions were comparable to published serial studies for both timings, for AIDP (p = 0.25; p = 0.10) and axonal GBS (p = 0.73; p = 0.56) but were higher than with serial studies for equivocal forms in patients studied on days 0–14 (p = 0.012), although not in those studied on days 15–42 (p = 0.17). This suggests that over the initial 6 weeks post-onset, timing fails to influence subtype proportions in a large GBS cohort, irrespective of criteria used. Repeat studies appear therefore unlikely to be helpful when systematically performed within this time frame, except in equivocal cases. The benefit of repeat studies remains possible at other times but may need to be individualized, and requires future prospective evaluation.
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Published online: July 14, 2015
Accepted: July 10, 2015
Received in revised form: July 7, 2015
Received: May 7, 2015
© 2015 Elsevier B.V. Published by Elsevier Inc. All rights reserved.