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Mean heart rates and their variability indices during REM sleep and the frequency of cardiac arrhythmias during the sleep-awake cycle were determined in a group of coronary patients with disturbances of cardiac rhythm. In some patients there was a temporal relationship of atrial and ventricular premature contractions with slow-wave sleep, REM sleep or wakefulness. However, when they were considered as a group, no significant correlation could be observed. Furthermore, the sinus arrhythmia characteristic of REM sleep was not found to be exaggerated in those patients.
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