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Related Experiment Videos

Cardiovascular changes associated with obstructive sleep apnea syndrome.

R Stoohs1, C Guilleminault

  • 1Sleep Disorders Clinic and Research Center, Stanford University School of Medicine, California 94305.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 1, 1992
PubMed
Summary

Severe obstructive sleep apnea impacts cardiovascular health differently during sleep stages. Cardiac output drops significantly during REM sleep apneas due to lack of compensatory stroke volume changes.

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Area of Science:

  • Cardiology
  • Sleep Medicine
  • Physiology

Background:

  • Obstructive sleep apnea (OSA) is a common condition affecting cardiovascular health.
  • Sleep stages, specifically non-rapid-eye-movement (NREM) and rapid-eye-movement (REM) sleep, may differentially influence cardiovascular responses during apneas.

Purpose of the Study:

  • To investigate the impact of sleep states (NREM vs. REM) on cardiovascular variables during obstructive sleep apneas.
  • To analyze changes in heart rate, stroke volume, cardiac output, and blood pressure during apneas in different sleep stages.

Main Methods:

  • Analysis of 128 obstructive apneas (72 in stage 2 NREM, 56 in REM sleep) from five male patients with severe OSA.
  • Measurement of heart rate, stroke volume, cardiac output, blood pressure, esophageal pressure, and arterial O2 saturation using an electrical impedance system and radial artery catheterization.

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Main Results:

  • Heart rate patterns differed between NREM and REM sleep during obstructive periods.
  • In NREM sleep, heart rate and stroke volume changes maintained a stable cardiac output during apneas.
  • In REM sleep, a lack of compensatory stroke volume changes led to a significant drop in cardiac output, while blood pressure consistently increased during apneas.

Conclusions:

  • Sleep state significantly modulates cardiovascular responses during obstructive sleep apneas.
  • The inability to compensate cardiac output during REM sleep apneas may have critical implications for cardiovascular health in OSA patients.