Buckingham T A, Thessen C M, Hertweck D, Janosik D L, Kennedy H L
St. Louis University Medical Center, Missouri.
Am J Cardiol. 1989 Apr 1;63(12):820-5. doi: 10.1016/0002-9149(89)90050-7.
The noninvasive signal-averaged electrocardiographic detection of late potentials correlates with the spontaneous occurrence of sustained ventricular tachycardia (VT). Frequency analysis of the electrocardiographic signal from the terminal QRS and ST segment also correlates with sustained VT. This study was designed to compare these 2 methods by analysis of signals recorded from the same hardware system. Signals were recorded from 234 patients with prior myocardial infarctions with a commercially available signal-averaging system. Patients were classified into 2 groups: group 1 consisted of 84 patients with VT and group 2 consisted of 150 patients without VT. In the frequency domain, magnitude and energy area ratios and peak ratios of the spectral plot from 20 to 50 Hz over 0 to 20 Hz were calculated for a 140-ms interval starting 60 ms after the beginning of the QRS. In the time domain, the duration of the filtered QRS was 121 +/- 29 ms for group 1 and 110 +/- 25 ms for group 2 (p less than 0.002). The duration of the terminal QRS less than 40 microV was 45 +/- 21 ms in group 1 and 36 +/- 18 ms in group 2 (p less than 0.001). The root-mean-square amplitude of the terminal 40 ms of the QRS was 25 +/- 24 microV in group 1 and 36 +/- 33 microV in group 2 (p less than 0.004).(ABSTRACT TRUNCATED AT 250 WORDS)
无创信号平均心电图对晚电位的检测与持续性室性心动过速（VT）的自然发生相关。对终末QRS和ST段心电图信号的频率分析也与持续性VT相关。本研究旨在通过分析来自同一硬件系统记录的信号来比较这两种方法。使用商用信号平均系统记录了234例既往有心肌梗死患者的信号。患者分为两组：第1组由84例VT患者组成，第2组由150例无VT患者组成。在频域中，从QRS开始后60毫秒起的140毫秒间隔内，计算20至50赫兹频谱图相对于0至20赫兹的幅度、能量面积比和峰值比。在时域中，第1组滤波后QRS的持续时间为121±29毫秒，第2组为110±25毫秒（p<0.002）。终末QRS小于40微伏的持续时间在第1组为45±21毫秒，第2组为36±18毫秒（p<0.001）。QRS终末40毫秒的均方根振幅在第1组为25±24微伏，第2组为36±33微伏（p<0.004）。（摘要截短于250字）
