Different Effects of Alcohol and Salt on 24-Hour Blood Pressure and Heart Rate in Hypertensive Patients.

  • Kawano Yuhei
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Abe Hitoshi
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Kojima Shunichi
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Yoshimi Hiroki
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Sanai Toru
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Kimura Genjiro
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Matsuoka Hiroaki
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Takishita Shuichi
    the Division of Hypertension and Nephrology, National Cardiovascular Center
  • Omae Teruo
    the Division of Hypertension and Nephrology, National Cardiovascular Center

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To compare the influences of alcohol and salt intake on 24-h blood pressure (BP), we studied short-term effects of repeated alcohol ingestion and dietary salt intake in hypertensive patients. Thirty-two Japanese men with mild to moderate essential hypertension (54±1 years old, mean±SE) were examined. Sixteen patients were given alcohol (1ml/kg) with dinner for 7d after a 7-d control period with an isocaloric beverage. Another group consisting of 16 age- and weight-matched patients consumed a low-sodium diet (25mmol/d) for 7d, followed by a high-sodium diet (250mmol/d) for 7d. Twenty-four-hour BP was measured at the end of each period. Average 24-h BP in the alcohol period (137±4/83±2mmHg) was similar to that in the control period (138±4/84±2mmHg). However, BP in the alcohol period was significantly lower in the evening, but significantly higher in the morning than that in the control period. Heart rate increased for several hours after alcohol ingestion, resulting in a significant increase in 24-h heart rate (67±2 vs. 64±2 beats/min). Average 24-h BP was higher in the high salt period (144+4/89± 4mmHg) than in the low salt period (135±3/85±3mmHg, p<0.05). The pressor effect of high salt intake was sustained throughout the day and was associated with a decrease in 24-h heart rate (60±2 vs. 66±2 beats/min). In conclusion, short-term repeated intake of alcohol may have little effect on average 24-h BP while it causes an evening fall and a morning rise in BP, and high salt intake raises BP throughout the day. Alcohol consumption increases and salt loading decreases 24-h heart rate. (Hypertens Res 1996; 19: 255-261)

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