冠心病患者心室晚电位及心率变异改变的探讨

目的　研究冠心病患者心室晚电位 (VLP)及心率变异 (HRV)的改变 ,探讨VLP、HRV对冠心病病情预测及心脏事件发生的防治。方法　随机分为冠心病组 73例 ,对照组 6 0例。检测VLP的QRS终未 4 0UV以下振幅的持续时间 (D40 ) ,QRS终未 4 0ms内的均方根电压 (V40 ) ,经滤波后QRS总的持续时间 (QRST)。检测HRV的各种指标 :全程NN间期标准差 (SDNN) ,全程NN间期之差的均方根 (RMSSD) ,NN5 0除以总的NN间期的个数 (PNN5 0 ) ,低频段功率 (LF)与高频段功率 (HF)之比 (LF/HF)。结果　冠心病组VLP阳性率 2 6 0 3% (19/ 73) ,对照组阳性率 6 6 7% (4 / 6 0 )。冠心病组SDNN(99 5 1± 6 5 6 )ms、RMSSD(2 2 4 2±6 5 7)ms,PNN5 0 (5 4 0± 3 0 8) % ,LF/HF(4 38± 3 36 )。对照组SDNN(14 2 76± 79 6 6 )ms,RMSSD(2 7 89± 12 89)ms ,PNN5 0 (9 18±8 5 3) % ,LF/HF(1 5 2± 1 4 9)。经统计学处理两组SDNN、RMSSD、PNN5 0、LF/HF差异均有非常显著性差异 (P <0 0 1)。结论　冠心病组VLP、HRV均有显著性改变 ,提示冠心病患者存在心肌电活动异常及自主神经功能损害 ,存在心脏事件发生的危险性。

Study on the change of ventricular late potential and heart rate variability in patient with coronary heart disease

Objective To study the change of ventricular late potential(VLP) and heart rate variability(HRV) in patients with coronary heart disease(CHD).Method All patients were randomly into control group(60 cases) and CHD group(73 cases).Ventricular late potential message:D 40 ,V 40 ,QRST and HRV index:SDNN,RMSSD,PNN,LF/HF were measured in both groups.Results There were very significant difference between the normal control and the CHD group in VLP positive rate,SDNN,RMSSD,PNN50 and LF/HF.Conclusion There exist very significant changes in VLP and HRV in the CHD group,indicating damage of autonomic never system function,the abnormity of heart electrophysiological activities and the possible cardiac accidents risks in patients with CHD.