Hayashi H, Okajima M, Yamada K
Am Heart J. 1976 Jun;91(6):689-98. doi: 10.1016/s0002-8703(76)80533-9.
The P and the Ta waves of two patient groups with A-V block were magnified with a direct-current amplifier and recorded at a high paper speed. In Group A patients (those without serious cardiovascular complications except A-V block) the P and the Ta waves were recorded in the opposite direction in every lead and there was a linear relationship between the amplitude of the P and the Ta waves. The atrial gradient was nearly zero. There existed a positive correlation between the P + Ta time and the P-P interval. In Group B patients (those with serious cardiovascular complications besides A-V block) there were significant differences in the Ta wave from Group A with respect to form, polarity, amplitude, duration, and the relationship between the Ta and the P waves. The atrial gradient was markedly large. Careful attention should be paid to the deviation of the PQ segment caused by the Ta wave in daily ECG's to detect atrial abnormalities. The Ta wave extends into the ST segment and, while describing the deviation of the ST segment, the influence of the Ta wave should be kept in mind.
用直流放大器放大两组患有房室传导阻滞患者的P波和Ta波，并以高纸速记录。A组患者（除房室传导阻滞外无严重心血管并发症者），各导联记录的P波和Ta波方向相反，P波和Ta波振幅之间呈线性关系。心房梯度几乎为零。P+Ta时间与P-P间期呈正相关。B组患者（除房室传导阻滞外还有严重心血管并发症者）的Ta波在形态、极性、振幅、持续时间以及Ta波与P波的关系方面与A组有显著差异。心房梯度明显增大。日常心电图中应注意Ta波引起的PQ段偏移，以检测心房异常。Ta波延伸至ST段，在描述ST段偏移时，应牢记Ta波的影响。
