To determine the origin of conduction disturbances commonly seen in the ECG after correction of Fallot's tetralogy, 36 @entity1 underwent electrophysiologic studies; these included endocardial recordings of right ventricular (RV) and left ventricular (LV) apical activation and His-bundle recordings. The surface ECG showed a pattern of complete @entity714 ( @entity714 ) in 22, and @entity714 with @entity2270 ( @entity2270 )--so-called @entity616 --in nine; the remaining five had @entity714 , @entity2270 , and a long PR interval, often considered as indicating @entity616 . Eight of 22 @entity1 with @entity714 and normal axis had delayed RV apical activation (36%), indicating a proximal lesion. Of nine @entity1 with @entity714 and @entity2270 , four only had delayed RV apical activation (44%); in the other five, therefore, the @entity714 pattern was due to a peripheral lesion (ventriculotomy); they cannot be considered as having true @entity616 . LV activation was not delayed in any case. In five cases, the surface ECG suggested @entity616 (long PR in the presence of @entity714 and @entity2270 ). His-bundle recordings showed the HV interval to be prolonged in only two cases, at the upper limit of normal in two, and short in one. The AH interval was prolonged in all and was mainly responsible for the long PR interval. Thus, the surface ECG is not a reliable tool for making a diagnosis of true @entity616 and @entity16 after correction of Fallot's tetralogy. This may explain controversies existing about the prognosis of @entity616 .

Intraventricular conduction disturbances after correction of tetralogy of Fallot: can bifascicular and XXXX be diagnosed from the surface ECG?

@entity1 :: ('9606', 'Species') :: ['children', 'patients'] @entity714 :: ('MESH:D002037', 'Disease') :: ['RBBB', 'right bundle branch block'] @entity16 :: ('MESH:D009422', 'Disease') :: ['trifascicular damage'] @entity2270 :: ('MESH:C566610', 'Disease') :: ['LAD', 'left-axis deviation'] @entity616 :: ('MESH:D006327', 'Disease') :: ['trifascicular block', 'such conduction abnormalities', 'bifascicular block']
@entity616 :: (MESH:D006327,Disease) :: ['trifascicular block']
