Abstract
The contraction patterns induced by ectopic ventricular premature beats and ventricular tachycardias occurring in man during left ventriculography were analyzed. These were compared with contraction patterns induced by ventricular premature beats and tachycardias produced in five dogs by epicardial left ventricular apical or basilar stimulation. Two patterns of contraction observed in the animals corresponded to two patterns observed in man. Apically stimulated left ventricular beats produced an “hourglass” type of contraction pattern and were hemodynamically more effective than beats arising from basilar stimulation, which produced an inverse “teardrop” pattern. The same patterns were reproduced by experimental ventricular tachycardias. These observations stress the importance of a normal sequence of ventricular contraction to optimal cardiac function in man and warn against the hazards of misinterpretation of the left ventricular contraction pattern if the beat originates ectopically during ventriculography.
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