Exercise-induced changes of left ventricular ejection time in noninvasive evaluation of XXXX .

@entity662 @entity453 @entity1
Significance and clinical usefulness of exercise-induced changes of noninvasive left ventricular ejection time, recorded by mechanocardiography, in detecting @entity453 is still controversial. We investigated the changes of the left ventricular ejection time (LVET), corrected for heart rate as ETI (LVET/square root RR), after a standard 4-min exercise by bicycle ergometer (50 W/min for 2 min, increased by 20 W after 2 min) in 56 male volunteers. They were invasively studied for typical or atypical @entity662 . Thirty-four had @entity453 ( @entity453 ) and the others served as controls. Immediately after exercise LVET shortened according to the rise in heart rate in both groups. ETI increased similarly. After 2 minutes from exercise ETI increased only in the @entity453 group, according to a longer LVET, in spite of the rise in heart rate. In contrast, ETI was unchanged in controls, according to a shortened LVET. Totally, 27/34 @entity453 @entity1 and 9/22 controls had a greater ETI than at rest. Employing this delta ETI as a "marker" of @entity453 we found a predictive accuracy of 74%. We suggest postexercise ETI could be a simple and inexpensive support to electrocardiogram in basic evaluation of subjects with @entity662 .
