Abstract
Background: Since the prevalence of both sleep-disordered breathing (SDB) and periodic
limb movements in sleep (PLMS) increase with age, we explored whether older schizophrenia
patients would have a high incidence of SDB and PLMS. Correlations between sleep and
clinical variables were also examined.
Methods: Fifty-two patients (mean age = 59.6 years, SD = 8.9) had their sleep/wake,
respiration, and leg movements recorded using a modified Medilog/Respitrace portable
recording system plus oximetry. A battery of clinical, psychosocial, and motor disturbance
variables were collected by research center staff.
Results: Forty-eight percent of these patients had at least 10 respiratory events
per hour of sleep. These patients reported more symptoms of daytime sleepiness than
patients with fewer than 10 events per hour. The relatively high prevalence of SDB
in this group may contribute to overall sleep disturbances, and does not appear to
be a result of high body mass index. Only 14% of the patients had at least five limb
movements per hour of sleep, suggesting the prevalence of PLMS is much lower than
expected in this age group. The number of leg jerks was inversely related to symptoms
of tardive dyskinesia.
Conclusions: The disturbance of sleep in these patients may be due, in part, to SDB,
but is unlikely due to PLMS.
Keywords
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Article Info
Publication History
Accepted:
April 17,
1998
Received in revised form:
April 6,
1998
Received:
January 6,
1998
Identification
Copyright
© 1999 Society of Biological Psychiatry. Published by Elsevier Inc. All rights reserved.
