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为了解冠心病QRS波群频率变化趋势,采用频谱分析方法观察21例心肌梗死和15例心绞痛QRS波群功率谱比值(W值)的变化,结果显示:(1)两组QRS波群的频谱能量主要集中在低频段,30Hz以内的能量合计占93.0％—95.7％,30Hz以上的各频率成分的能量总和在4.0％左右;(2)两组W值比较;在0—10Hz和0—25Hz段,心绞痛组小于心肌梗死组(P<0.05);在11—30Hz和25—50Hz段,心绞痛组大于心肌梗死组(P<0.05);(3)在高频段仅在201—300Hz和401—500Hz两个频段,aVR、V_1、V_63个导联上显示心肌梗死组W值大于心绞痛组(P<0.05)。提示:(1)心肌梗死后可引起心电高频含量向低频含量转移,(2)心肌梗死时高频含量增多,(3)Ⅲ和V_4导联W值变化有较大临床应用价值。
In order to understand the trend of QRS complex frequency in coronary heart disease, the spectral analysis was used to observe the changes of power spectral ratio (W) in 21 cases of myocardial infarction and 15 cases of QRS complex of angina pectoris. The results showed that: (1) The energy is mainly concentrated in the low frequency band, the energy within 30Hz accounts for 93.0% -95.7%, and the sum of the energy of each frequency component above 30Hz is about 4.0%; (2) The comparison of W value of the two groups; at 0-10Hz and 0-25Hz (P <0.05). In the 11-30Hz and 25-50Hz segments, the angina pectoris group was larger than the myocardial infarction group (P <0.05). (3) In the high frequency range, only 201-300Hz and 401- 500Hz two bands, aVR, V_1, V_63 leads showed myocardial infarction W value is greater than the angina group (P <0.05). It is suggested that: (1) myocardial infarction can cause high frequency content of ECG to transfer to low frequency content; (2) high frequency content of myocardial infarction increase; (3) W values of Ⅲ and V_4 leads have great clinical value.