[Variations of blood flow in pulmonary veins caused by electric stimulation in total atrioventricular block]. / Variazioni del flusso nelle vene polmonari da stimolazione elettrica nel blocco atrioventricolare totale.

ABSTRACT

It was suggested that Doppler study of pulmonary venous flow (PVF) in combination with mitral flow is useful to evaluate ventricular function. In order to investigate the utility of PVF study in patients with total A-V block treated with pacemaker DDD, we performed transesophageal echocardiography pulsed Doppler of PVF and mitral flow in 12 patients. We measured the following parameters in PVF peak systolic velocities (S1 and S2), peak diastolic velocity (D) reversal atrial flow diastolic deceleration time. In mitral flow we measured E wave, A wave and deceleration time of E. We compared our results with the same patients with pacemaker inhibited. In patients with total A-V block with pacemaker inhibited we reported one systolic wave of PVF, a larger D wave with a shortened deceleration time. The PVA seems to disappear. Transmitral flow slowed a higher E wave in patients A-V block with pacemaker inhibited. In patients with total A-V block stimulated by DDD pacemaker we restored the atrioventricular sequentialty; therefore electric stimulation determines the onset of S1 peak and the reduction of S2 peak and the systematic presence of the atrial-pulmonary regurgitant wave.