Abstract
With use of the Doppler ultrasonic flowmeter catheter telemetry system, blood flow velocity was recorded from various left ventricular cavity sites in 57 conscious subjects with atrial arrhythmias. Premature atrial depolarizations reduced peak left ventricular blood flow velocity in direct relation to their respective coupling intervals. Paroxysmal supraventricular and multifocal atrial tachycardias produced a decrease in peak left ventricular blood velocity, with the most marked reductions measured at the onset of the tachyarrhythmias. Atrial flutter and fibrillation resulted in midcavity and inflow tract diastolic blood velocity waves that were inscribed in conjunction with atrial depolarizations seen on the simultaneously recorded electrocardiogram. Irregular ventricular responses and changing atrioventricular conduction ratios produced marked irregularity of peak flow velocity. These findings provide the first comprehensive description of left ventricular blood flow velocity during atrial arrhythmias in man.
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