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J Am Coll Cardiol, 1986; 7:693-695 © 1986 by the American College of Cardiology Foundation |
Pulmonary venous flow has two phases (systolic and diastolic) in normal subjects when studied by pulsed Doppler echocardiography. Only one phase of pulmonary venous flow (diastolic) was observed in six patients without synchronous atrial contraction (four patients with atrial fibrillation and two with complete atrioventricular [AV] block). This pattern reversed to normal (biphasic) when AV synchrony was reestablished by cardioversion to sinus rhythm in patients with atrial fibrillation and by AV sequential pacing in patients with complete AV block. Thus, both atrial and ventricular contraction and relaxation are important determinants of pulmonary venous flow.
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