@entity616 detected by electrophysiologic testing following repair of ostium primum XXXX .

@entity1 @entity1165 @entity713 @entity474 @entity1817 @entity956 @entity955 @entity4710 @entity1168 @entity616
Since 1983 we have performed electrophysiologic studies in 6 @entity1 who had previously undergone repair of an ostium primum @entity474 . Information obtained during electrophysiologic studies was crucial in guiding appropriate pacemaker therapy in these @entity1 . As judged from the resting electrocardiogram, sinus or junctional @entity1168 was present in 3/6, @entity955 in 2/6, and paced rhythm in 2 @entity1 who had had ventricular pacemakers implanted for complete @entity713 . During maximal exercise testing 4 @entity1 had reduced heart rates; 2 had sudden drops in heart rate at 1 min postexercise; 1 @entity1 had exercise induced ventricular bigeminy; and 1 @entity1 with @entity956 : 1-4: 1 block at rest developed 1: 1 conduction during Stage II with an effective ventricular rate of 220/min. During electrophysiologic studies, the maximum corrected sinus node recovery time was abnormal in five of the six, ranging from 410 to 5630 msec. There was no spontaneous atrial rhythm in the other @entity1 . Complete @entity713 was present in 2 @entity1 while the @entity713 occurred abnormally at atrial pacing cycle lengths greater than 450 msec in 2 others. @entity4710 or @entity955 , was either spontaneous or induced in 2/6 @entity1 , while @entity1165 was induced in 1/3 @entity1 who underwent programmed ventricular stimulation. Electrophysiologic studies were important in unmasking severe @entity1817 in 3 @entity1 and @entity1817 in 2. We therefore recommend that electrophysiologic studies be strongly considered as part of the evaluation of @entity616 following repair of ostium primum @entity474 .
