Key result
Vectorcardiogram analysis in tetralogy of Fallot revealed right ventricular hypertrophy in group I, increased left ventricular activity in group II, and right bundle-branch block in group III.
Why the study?
The analysis and description of preoperative and postoperative vectorcardiograms in tetralogy of Fallot patients were needed to characterize electrical activity changes.
Observational
Vectorcardiograms in tetralogy of Fallot demonstrate distinct patterns of right ventricular hypertrophy, increased left ventricular activity, and right bundle-branch block depending on the patient group.
May inform postoperative RVH and conduction assessment in TOF; leaves open validation against modern modalities.
The analysis and description of the preoperative and postoperative vectorcardiograms in tetralogy of Fallot are presented. The spatial orientation of the maximum QRS vectors to the right, anteriorly, and inferiorly in group I is indicative of right ventricular hypertrophy. In group II patients, the vectorcardiogram showed evidence of increased electrical activity of the left ventricle. Vectorcardiographic patterns of complete right bundle-branch block were noted in nine patients in group III.
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Khoury et al. (1965) conducted an observational in Tetralogy of Fallot. Surgical repair vs. Preoperative state was evaluated on Vectorcardiographic patterns. Vectorcardiogram analysis in tetralogy of Fallot revealed right ventricular hypertrophy in group I, increased left ventricular activity in group II, and right bundle-branch block in group III.
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