Van de Werf F, Piessens J, Kesteloot H, De Geest H
Acta Cardiol. 1978;33(5):295-303.
The time relationship between left apexcardiogram and left ventricular pressure was studied in 56 patients with heart disease. The apexcardiogram was recorded by means of a pressure transducer in 20 patients (group I). In 36 patients a displacement transducer was used (group II). The beginnings of the systolic upstroke of left ventricular pressure and left apexcardiogram were nearly simultaneous in both groups. The protodiastolic nadir of the apex tracing, however, preceeded the corresponding point on the pressure tracings by 23.8 msec in group I and 7.8 msec in group II (mean values). The peak of the first derivative of the apexcardiogram in group II preceeded the peak of the first derivative of the intraventricular pressure by a mean of 13.4 msec. In group I the time difference was small and statistically insignificant. It is concluded that apexcardiography allows an accurate determination of the onset and time course of ventricular contraction but is less precise for the determination of the protodiastolic nadir.
对56例心脏病患者研究了心尖搏动图与左心室压力之间的时间关系。20例患者（I组）使用压力换能器记录心尖搏动图。36例患者（II组）使用位移换能器。两组中左心室压力收缩期上升起点和心尖搏动图几乎同时出现。然而，I组心尖搏动图舒张前期最低点比压力图上相应点提前23.8毫秒，II组提前7.8毫秒（平均值）。II组心尖搏动图一阶导数峰值比心室内压力一阶导数峰值平均提前13.4毫秒。I组时间差小且无统计学意义。结论是心尖搏动图能够准确测定心室收缩的起始和时间过程，但在测定舒张前期最低点方面不太精确。
