The apexcardiogram in XXXX .

@entity1 @entity12118 @entity63 @entity2121 @entity1459 @entity951 @entity741 @entity299 @entity583
The apexcardiogram (acg), when recorded serially in @entity1 with @entity583 ( @entity583 ), @entity1459 ( @entity1459 ) and stable @entity741 ( @entity741 ), appeared to reflect the abnormal patterns of contraction of the left ventricle in these conditions. Thus, @entity2121 (dyskinesis) of the systolic wave or increased "a" wave amplitude with gradual recovery over several weeks was found in all 60 @entity1 with documented @entity583 and in 18 of 20 @entity1 with @entity1459 . Electrocardiogram changes were noted, however, in only eight of the @entity1459 @entity1 . Changes in the acg frequently antedated @entity63 in the ecg. Paradoxical bulging of the systolic wave of the acg was additionally noted in @entity1 during the @entity951 but this promptly disappeared after the administration of @entity12118 . @entity1 with @entity951 often had normal resting ecg's but abnormal resting acg's. In contrast to the relatively transient abnormalities noted above, the acg remained unchanged in most @entity1 with stable @entity741 during follow-up of three months to two years. @entity1 undergoing coronary bypass operations, however, showed immediate improvement in the acg in the postoperative period. These results suggest the acg reflects the contractile pattern of the left ventricle, and may be an indirectly recorded ventriculogram. Its enhanced sensitivity and the earlier development of changes in comparison to the ecg make this a valuable tool in the study of @entity1 with @entity299 .
