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Cardiovascular Regulation in Obstructive Sleep Apnea.

Michael G Ziegler¹, Milos Milic, Hamzeh Elayan

¹University of California, San Diego, Medical Center, Department of Medicine, 200 West Arbor Drive, San Diego, CA 92103-8341, USA.

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Summary

Obstructive sleep apnea (OSA) frequently causes hypertension due to metabolic syndrome and intermittent hypoxia. Treating OSA modestly lowers blood pressure, but blocking sympathetic overactivity with specific agents is more effective for hypertensive patients with OSA.

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Area of Science:

Cardiology
Sleep Medicine
Endocrinology

Background:

Hypertension is a common complication in patients with obstructive sleep apnea (OSA), linked to metabolic syndrome.
Animal and human studies show intermittent hypoxia in OSA activates sympathetic nerves, damages endothelium, and impairs blood pressure regulation.

Purpose of the Study:

To explore the relationship between obstructive sleep apnea, hypertension, and sympathetic nervous system activity.
To evaluate the effectiveness of different treatments for hypertension in OSA patients.

Main Methods:

Review of animal studies on intermittent hypoxia and sympathetic nerve activity.
Analysis of human studies investigating sympathetic nerve responses and pressor reactions in OSA patients.
Evaluation of treatment outcomes for hypertension in OSA, including OSA treatment, beta-blockers, angiotensin antagonists, and diuretics.

Main Results:

Intermittent hypoxia in OSA stimulates sympathetic nerve activity and causes endothelial damage.
OSA treatment normalizes sympathetic responses but only modestly reduces blood pressure.
Beta-blockers and angiotensin antagonists effectively lower blood pressure in hypertensive OSA patients, while diuretics are less successful.

Conclusions:

Hypertension in OSA patients involves increased sympathetic nerve activity and metabolic syndrome.
Targeting sympathetic overactivity is crucial for managing hypertension in OSA.
Comprehensive treatment strategies considering both OSA and metabolic syndrome are necessary for hypertensive OSA patients.