Engel T R, Vallone N, Windle J
Department of Internal Medicine, University of Nebraska College of Medicine, Omaha.
Am Heart J. 1988 Mar;115(3):592-7. doi: 10.1016/0002-8703(88)90809-5.
The signal-averaged QRS complex that is prolonged because of low amplitude late potentials predicts ventricular tachycardia. This study investigated if signal-averaged low amplitude atrial potentials predict atrial fibrillation or flutter (AFF). Low amplitude potentials were considered to be high-frequency, high amplitude P (HiFP) duration recorded between 50 and 250 Hz at 1.0 mm/microV amplitude minus unfiltered P (UnFP) duration at 0.1 mm/microV. In nine normals, HiFP averaged 115.6 msec +/- 9.8 SD. HiFP were wider in 26 control patients (133.5 msec +/- 15.7, p less than 0.005) but HiFP-UnFP (11.2 msec +/- 8.5) and signals less than 10 microV terminating HiFP inscription (21.7 msec +/- 23.4) were similar to normal values. Seventeen patients with paroxysmal or recently cardioverted AFF did not have significantly longer intervals than controls (HiFP averaged 138.8 msec +/- 23.0, HiFP-UnFP 13.2 msec +/- 9.3, and signals less than 10 microV 32.4 msec +/- 19.5). Therefore, signal-averaged P waves do not identify patients with AFF.
由于低振幅晚期电位而延长的信号平均QRS波群可预测室性心动过速。本研究调查了信号平均低振幅心房电位是否可预测心房颤动或扑动（AFF）。低振幅电位被认为是在50至250Hz、1.0mm/μV振幅下记录的高频、高振幅P（HiFP）持续时间减去0.1mm/μV下未滤波的P（UnFP）持续时间。在9名正常人中，HiFP平均为115.6毫秒±9.8标准差。在26名对照患者中HiFP更宽（133.5毫秒±15.7，p<0.005），但HiFP - UnFP（11.2毫秒±8.5）以及终止HiFP记录的小于10μV的信号（21.7毫秒±23.4）与正常值相似。17名阵发性或近期复律的AFF患者的间期与对照组相比无显著延长（HiFP平均为138.8毫秒±23.0，HiFP - UnFP为13.2毫秒±9.3，小于10μV的信号为32.4毫秒±19.5）。因此，信号平均P波不能识别AFF患者。
