Breithardt G, Loogen F, Schmiel F K, Seipel L
Am Heart J. 1975 Jun;89(6):759-65. doi: 10.1016/0002-8703(75)90191-x.
The detection of premature ectopic beats coinciding with the T-wave of the antecedent beat is important for patient monitoring. In the method described here, the difficulties of direct measurement of QT time are avoided by evaluating the changes of QT time according to heart rate by use of a diode function generator. An analog circuit is used for comparing the computed QT time with the coupling interval of successive beats. In case of a R-on-T-phenomenon an alarm is given. The frequency of alarms is registered on a trend recorder. The methods is based on empirical equations which all contain a constant factor. Our investigations showed that the variability of this factor during longer periods of monitoring was small enough to allow sufficient exactness of the evaluation procedure.
检测与前一心搏的T波同时出现的过早异位搏动对患者监测很重要。在此描述的方法中，通过使用二极管函数发生器根据心率评估QT间期的变化，避免了直接测量QT间期的困难。使用模拟电路将计算出的QT间期与连续心搏的耦合间期进行比较。出现R-on-T现象时会发出警报。警报频率记录在趋势记录器上。该方法基于均包含一个常数因子的经验公式。我们的研究表明，在较长时间的监测过程中，该因子的变异性足够小，足以保证评估程序有足够的准确性。
