Hachisuka A, Komori T, Abe T, Hachisuka K. Repeater F-waves are signs of motor unit pathology in polio survivors.
Muscle Nerve 2015;
51:680-5. [PMID:
25154598 PMCID:
PMC6680179 DOI:
10.1002/mus.24428]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/18/2014] [Indexed: 12/14/2022]
Abstract
INTRODUCTION
The purpose of this study was to determine whether F-waves reveal electrophysiological features of anterior horn cells in polio survivors.
METHODS
Forty-three polio survivors and 20 healthy controls underwent motor nerve conduction studies of the median and tibial nerves bilaterally, including sampling of F-waves elicited by 100 stimuli and the determination of motor unit number estimation (MUNE).
RESULTS
A significant increase in abnormally stereotyped ("repeater") F-waves and a reduction of F-wave persistence were observed in both nerves in the polio group as compared with the control group. Repeater F-waves had a negative correlation with MUNE.
CONCLUSIONS
These trends in F-wave persistence and repeater F-waves after motor unit loss are characteristic findings in polio survivors. Repeater F-waves are a sign of motor unit pathology.
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