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分析４８例急性心肌梗塞患者（心梗组）发病４８小时内的心率变异性（ＨＲＶ）变化，并与４２例无器质性心脏病的对照组进行对比，结果表明：心梗组ＨＲＶ明显降低，其标准差均值、平均Ｒ－Ｒ间期的变异数、平均Ｒ－Ｒ间期的标准差以及平均Ｒ－Ｒ间期标准差的标准差均明显低于对照组（Ｐ＜０．０１）。表明ＨＲＶ能较好地反映体内迷走神经和交感神经的相互作用，对心梗后患者的预后有极好的预测价值。
The changes of heart rate variability (HRV) in 48 patients with acute myocardial infarction (MI group) within 48 hours after onset were analyzed and compared with 42 patients without organic heart disease. The results showed that the HRV was significantly decreased in MI group (P <0.01). The standard deviations of mean standard deviation, mean R-R interval variability, mean R-R interval standard deviation and standard R-R interval standard deviation were all significantly lower than those of the control group . That HRV can better reflect the vagus nerve and sympathetic interaction in vivo, the prognosis of patients with myocardial infarction have excellent predictive value.