Effects of alcohol on sympathetic activity, hemodynamics, and chemoreflex sensitivity

Hypertension
P J van de BorneV K Somers

Abstract

Alcohol intake has been shown to worsen obstructive sleep apnea and increase nocturnal hypoxemia. The mechanisms of this action are unclear. Animal studies suggest that a reduction in chemoreflex sensitivity may be implicated. Using a double-blind, randomized, vehicle-controlled design, we tested the hypothesis that oral alcohol intake depresses chemoreflex sensitivity in humans. We examined the effects of oral alcohol intake (1.0 g/kg body wt) on blood pressure, heart rate, heart rate variability, muscle sympathetic nerve activity, forearm vascular resistance, and minute ventilation in 16 normal male subjects. Peripheral and central chemoreflex sensitivity were measured in response to hypoxia (n = 10) and hypercapnia (n = 6), respectively. Plasma alcohol increased from 0 to 23.2 +/- 1.5 mmol/L (107 +/- 7 mg/dL) at 60 minutes and 20.2 +/- 1 mmol/L (93 +/- 4 mg/dL) at 85 minutes after alcohol intake (P < .0001). Alcohol induced an increase in heart rate from 59 +/- 2 to 66 +/- 2 beats per minute (P < .01) and increased the ratio of low- to high-frequency variability of heart rate (P < .05). Although alcohol increased sympathetic nerve activity by up to 239 +/- 22% of baseline values (P < .01), forearm vascular resistance after a...Continue Reading

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