期刊
JOURNAL OF APPLIED PHYSIOLOGY
卷 88, 期 3, 页码 1093-1102出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/jappl.2000.88.3.1093
关键词
autonomic nervous system; canine; hyperoxia; pulmonary arterial pressure; sleep; systemic arterial pressure; ventricular stroke volume
资金
- NHLBI NIH HHS [HL-51292] Funding Source: Medline
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R55HL051292, R29HL051292] Funding Source: NIH RePORTER
Obstructive sleep apnea (OSA) acutely increases systemic (Psa) and pulmonary (Ppa) arterial pressures and decreases ventricular stroke volume (SV). In this study, we used a canine model of OSA (n = 6) to examine the role of hypoxia and the autonomic nervous system (ANS) in mediating these cardiovascular responses. Hyperoxia (40% oxygen) completely blocked any increase in Ppa in response to obstructive apnea but only attenuated the increase in Psa. In contrast, after blockade of the ANS (20 mg/kg iv hexamethonium), obstructive apnea produced a decrease in Psa (-5.9 mmHg; P < 0.05) but no change in Ppa, and the fall in SV was abolished. Both the fall in Psa and the rise in Ppa that persisted after ANS blockade were abolished when apneas were induced during hyperoxia. We conclude that 1)hypoxia can account for all of the Ppa and the majority of the Psa response to obstructive apnea, 2) the ANS increases Psa but not Ppa in obstructive apnea, 3) the local effects of hypoxia associated with obstructive apnea cause vasodilation in the systemic vasculature and vasoconstriction in the pulmonary vasculature, and 4) a rise in Psa acts as an afterload to the heart and decreases SV over the course of the apnea.
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