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Journal of Applied Physiology, Vol 72, Issue 2 583-589, Copyright © 1992 by American Physiological Society
ARTICLES |
R. Stoohs and C. Guilleminault
Sleep Disorders Clinic and Research Center, Stanford University School of Medicine, California 94305.
Five men free of lung or cardiovascular diseases and with severe obstructive sleep apnea participated in a study on the impact of sleep states on cardiovascular variables during sleep apneas. A total of 128 obstructive apneas [72 from stage 2 non-rapid-eye-movement (NREM) sleep and 56 from rapid-eye-movement (REM) sleep] were analyzed. Each apnea was comprised of an obstructive period (OP) followed by a hyperventilation period, which was normally associated with an arousal. Heart rate (HR), stroke volume (SV), cardiac output (CO) (determined with an electrical impedance system), radial artery blood pressures (BP), esophageal pressure nadir, and arterial O2 saturation during each OP and hyperventilation period were calculated for NREM and REM sleep. During stage 2 NREM sleep, the lowest HR always occurred during the first third of the OP, and the highest was always seen during the last third. In contrast, during REM sleep the lowest HR was always noted during the last third of the OP. There was an inverse correlation when the percentage of change in HR over the percentage of change in SV during an OP was considered. The HR and SV changes during NREM sleep allowed maintenance of a near-stable CO during OPs. During REM sleep, absence of a compensatory change in SV led to a significant drop in CO. Systolic, diastolic, and mean BP always increased during the studied OPs.(ABSTRACT TRUNCATED AT 250 WORDS)
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