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Excessive Fragmentary Myoclonus: Time of Night and Sleep Stage Distributions

Published online by Cambridge University Press:  18 September 2015

Otavio Lins ,
Michelle Castonguay ,
Wayne Dunham ,
Sonya Nevsimalova  and
Roger Broughton
Otavio Lins*
Affiliation:
Ottawa General Hospital and University of Ottawa, Ottawa
Michelle Castonguay
Affiliation:
Ottawa General Hospital and University of Ottawa, Ottawa
Wayne Dunham
Affiliation:
Ottawa General Hospital and University of Ottawa, Ottawa
Sonya Nevsimalova
Affiliation:
Ottawa General Hospital and University of Ottawa, Ottawa
Roger Broughton
Affiliation:
Ottawa General Hospital and University of Ottawa, Ottawa
*
Division of Neurology, Ottawa General Hospital, Ottawa, Ontario, Canada K1H 8L6
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Abstract:

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Excessive fragmentary myoclonus during sleep consists of high amounts of brief twitch-like movements occurring asynchronously and asymmetrically in different body areas and has been reported to occur in association with a number of sleep disorders. It was analyzed using a new technique of quantification, the fragmentary myoclonus index (FMI). The FMI exhibited high rates in all stages of sleep but with a somewhat lower frequency in slow wave sleep explaining, as well, a significantly lower rate in the first hour after sleep onset compared to later hours. There was no evidence for greater sleep fragmentation or lighter sleep compared to a matched patient group in whom it had not been noted.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 20 , Issue 2 , May 1993 , pp. 142 - 146
Copyright
Copyright © Canadian Neurological Sciences Federation 1993

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