Abstract:Electrocardiogram, atrial electrogram, phonocardiogram, aortic pressure, and left ventricular pressure were recorded during periods of induced atrial fibrillation in dogs anesthetized with a combination of morphine sulfate and pentobarbital sodium. Data were accumulated by selecting 50 cardiac cycles which terminated in ectopic ventricular electrical complexes, and comparing systolic time intervals (STI) following these beats with STI following 50 normal ventricular complexes. Ectopic ventricular activation pr… Show more
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