DIFFERENCES IN TRANSMITRAL FLOW VELOCITY PATTERN DURING INCREASE IN PRELOAD IN PATIENTS WITH ABNORMAL LEFT-VENTRICULAR RELAXATION

Changes in transmitral flow (TMF) and pulmonary venous flow (PVF) velo cities during increases in preload were compared in patients with a hi gher peak atrial systolic velocity than peak early diastolic velocity (A/E > 1) for the TMF velocity to determine differences in hemodynamic response. Fifteen patients with dilated hearts, 22 with hypertrophied hearts and 15 control patients were studied. TMF and PVF velocities w ere recorded by transesophageal pulsed Doppler echocardiography before and during application of lower body positive pressure. The value for peak early diastolic velocity increased, while the isovolumic relaxat ion time decreased with increases in preload in all groups. The value for peak atrial systolic velocity decreased in the dilated-heart group , but increased in the hypertrophied-heart and control groups. The pea k second systolic and early diastolic PVF velocities increased in the dilated- and hypertrophied-heart groups, but did not change in the con trol group. The peak atrial systolic PVF velocity and the difference i n duration of the atrial systolic PVF and TMF velocities increased in the dilated- and hypertrophied-heart groups! and its changing rate was highest in the group with dilated hearts. These results suggest that both peak early diastolic and atrial systolic TMF velocities increase during increases in preload through the Frank-Starling mechanism in hy pertrophied hearts. Furthermore, the left ventricular functional reser ve was lower in the dilated-heart group. Thus, TMF and PVF velocities respond differently during increases in preload, depending on the unde rlying heart disease.