DIASTOLIC MITRAL REGURGITATION OBSERVED IN PATIENTS PITH COMPLETE ATRIOVENTRICULAR BLOCK DURING VENTRICULAR PACING

Abstract

Diastolic mitral regurgitation(MR) during ventricular pacing was studied in 15 patients (70.7±11.8‹SD› years old) with complete AV block. Cardiac index (CI) and pulmonary capillary wedge pressure (PCP) were measured by Swan-Ganz catheter. Trans-mitral flow was recorded by pulsed Doppler echocardiography. When the ventricular pacing was switched to AV sequential pacing, CI increased (2.1±0.4 to 2.7±0.4 1/min/m² p<0.01), and PCMP decreased (9.5±3.8 to 6.4±3.1mmHg, p<0.01). Left ventricular ejection fraction was 29-79%. Diastolic MR was observed in as the patients during ventricular pacing, and was prevented by AV sequential pacing. In conclusion, diastolic MR is a common fining in patients with AV block even if the heart rate is normalized by ventricular pacing.