BACKGROUND: @entity299 associated with @entity2916 induce @entity854 in the electrocardiogram. Electrocardiographic evidence of @entity123 may appear if the @entity5 is electrically active. To our knowledge, electrocardiographic evidence of @entity123 has been reported only in association with @entity712 . Follow-up studies of changes in electrocardiographic findings are also lacking. METHODS: We studied 21 consecutive @entity1 with @entity299 associated with @entity2916 , 10 males and 11 females, aged from the date of birth to 9 years at diagnosis. The mean period of follow-up was 53 months. None of the @entity1 developed @entity712 . We evaluated the electrocardiographic changes during the follow-up, and their association with echocardiographic findings. RESULTS: Of the 21 @entity1 , 12 showed one or more abnormalities on the electrocardiogram at presentation, with five demonstrating right or @entity4346 . In all of these five cases, the @entity5 were mainly located in the respective ventricular cavity. In one @entity1 with a @entity5 expanding exteriorly, there was marked @entity4346 on the electrocardiogram. Followup studies showed spontaneous regression of the @entity5 in 12 of 19 @entity1 , with abnormalities still present in only 7 @entity1 . A gradual disappearance of @entity4346 as seen on the electrocardiogram was noted in the @entity1 with marked @entity4346 at presentation in parallel with regression of the @entity5 . CONCLUSIONS: The presence of @entity299 in @entity1 with @entity2916 might explain the @entity123 seen on the electrocardiogram through its electrically active tissue without ventricular pressure overload or ventricular enlargement, although @entity3155 might affect the amplitude of the QRS complex. Even in cases with large @entity5 , nonetheless, the electric potential might- not alter the surface electrocardiogram if the direction of growth of the @entity5 is towards the ventricular cavity. In many cases, @entity854 tend to disappear, concomitant with regression of the @entity5 .

Electrocardiographic changes in @entity1 with @entity299 associated with XXXX .

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity712 :: ('MESH:D006333', 'Disease') :: ['congestive heart failure'] @entity3155 :: ('MESH:D011226', 'Disease') :: ['pre-excitation'] @entity5 :: ('MESH:D009369', 'Disease') :: ['giant tumour', 'tumours', 'tumour'] @entity854 :: ('MESH:D018376', 'Disease') :: ['various abnormalities', 'electrocardiographic abnormalities'] @entity2916 :: ('MESH:D014402', 'Disease') :: ['tuberous sclerosis'] @entity4346 :: ('MESH:D017379', 'Disease') :: ['left ventricular hypertrophy'] @entity299 :: ('MESH:D006331', 'Disease') :: ['cardiac rhabdomyomas', 'Cardiac rhabdomyomas', 'cardiac rhabdomyoma'] @entity123 :: ('MESH:D024741', 'Disease') :: ['ventricular hypertrophy']
@entity2916 :: (MESH:D014402,Disease) :: ['tuberous sclerosis']
