Relation of Left Ventricular Ejection Period to the Q-T Interval of the Electrocardiogram

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Abstract
Simultaneous recordings of the pressure pulses of the left ventricle and the ascending aorta, and a leg lead of the ecg., were made on dogs in a number of exptl. states. There was no apparent relation between the end of ejection and the end of the T wave. Altered hemodynamic conditions might alter the ejection period acutely but leave the ecg. timing unchanged. When an occlusion of the ascending aorta largely prevented ejection, the period of tension rise also proved relatively constant for changing conditions, but, as with the Q-T interval, did show a tendency to change with cycle length. The peak tension was developed at about the same time as the peak of the T wave. When the occlusion was released during a beat, ejection could begin late and continue through almost the whole of the period of decreasing tension. A speculative application of this situation to the normal ejection process is presented.

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