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目的 探讨急性心肌梗塞患者的心率变异性。方法 对３４例急性心肌梗塞（ＡＭＩ）患者及３０例正常对照者２４小时动态心电图进行分析，通过计算机人工确认窦性心搏后，经计算机处理，算出心率变异（ＨＲＶ）的时域和频域的各项指标。结果 ＡＭＩ组与对照组的平均心动周期标准差（ＳＤＮＮ）、相邻Ｒ－Ｒ 间期之差的均方根值（ｒＭＳＳＤ）、相邻Ｒ－Ｒ 间期差值＞ ５ ｍｓ 的百分比（ＰＮＮ５０）、低频（ＬＦ）、高频（ＨＦ）及ＬＦ／ＨＦ比值均有显著性差异（Ｐ＜ ０．０１）。结论 ＡＭＩ后心脏副交感神经张力水平下降，交感神经与副交感神经平衡失调，且与ＡＭＩ预后相关。
Objective To investigate the heart rate variability in patients with acute myocardial infarction. Methods Twenty-four patients with acute myocardial infarction (AMI) and 30 normal controls were analyzed for 24-hour ambulatory electrocardiogram (ECG). After sinus rhythm was manually confirmed by computer, the heart rate variability (HRV) Item indicator. Results Mean cardiac cycle standard deviation (SDNN), rMSSD of differences between adjacent R-R intervals, percentage of adjacent R-R intervals> 5 ms (PNN50 ), Low frequency (LF), high frequency (HF) and LF / HF ratio were significantly different (P <0.01). Conclusions After AMI, the level of parasympathetic tone decreased, and the sympathetic and parasympathetic balance were imbalanced, which was related to the prognosis of AMI.