目的 :观察小剂量倍他乐克对高血压病人心率变异性的影响。方法 :3 6例高血压低心率变异性病人服用 3 5mg/d～ 5 0mg/d倍他乐克进行 2 4h动态心电图监测 ,观察治疗前后心率变异性的改变 ,结果 :用药 2周后 3 6例病人心率变异性均有明显提高 ,其中 75 %的病人心率变异性达到正常水平以上 ,2 5 %的病人接近正常。结论 :小剂量倍他乐克对高血压病病人低心率变异性的干预治疗有显著作用 Objective: To observe the effect of low dose Betaloc on heart rate variability in hypertensive patients. Methods: Twenty-six hypertensive patients with low heart rate variability were treated with 35 mg / d ~ 50 mg / day metoprolol for 24 hours. The change of heart rate variability was observed before and after treatment. Results: After 2 weeks The heart rate variability of patients were significantly improved, of which 75% of patients with heart rate variability above the normal level, 25% of patients close to normal. Conclusions: The low-dose Betaloc has a significant effect on intervention of low heart rate variability in patients with essential hypertension