Summary
To study the effect of apnea and hypoventilation-induced hypoxemia on the heart, we carried out polysomnographic recordings over; 4 nights with electrocardiographic tracings in 30 patients with and without coronary heart disease. Evaluations of the data were based on the 2nd and 4th nights. In six subjects, five with coronary heart disease, we found 85 episodes of nocturnal ischemia, mainly during REM sleep (83.5%), high apnea activity, and sustained and progressive hypoxemia. Complex ventricular ectopy was observed in 14/13 patients (nights 2/4) and repetitive ventricular ectopy in 5/3. There was no significant difference in the quality and quantity of ventricular ectopy during wake and sleep states between the CHD group and the control group. In one patient ventricular bigeminy was observed only at a threshold of SaO2 below 60%. Bradyarrhythmia was made evident in four subjects from the CHD group and correlated mainly with apnea activity. We suppose that patients with sleep apnea and CHD are at cardiac risk because coronary heart disease can be aggravated by insufficient arterial oxygen supply due to cumulative phases of apnea and hypoventilation. The reduced hypoxic tolerance of the heart may lead to myocardial ischemia: and increased electrical instability.
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Abbreviations
- AI:
-
apnea index (apnea episodes per hour)
- bpm:
-
beats per minute (heart rate)
- CHD:
-
coronary heart disease
- NREM:
-
non-rapid eye movement
- PVC:
-
premature ventricular contraction
- REM:
-
rapid eye movement
- SRBD:
-
sleep-related breathing disorders
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Koehler, U., Dübler, H., Glaremin, T. et al. Nocturnal myocardial ischemia and cardiac arrhythmia in patients with sleep apnea with and without coronary heart disease. Klin Wochenschr 69, 474–482 (1991). https://doi.org/10.1007/BF01649418
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DOI: https://doi.org/10.1007/BF01649418