Key result
Postoperative RBBB with LAH occurs in ~9% after Fallot repair without late AV block or mortality.
Why the study?
The incidence and clinical significance of postoperative RBBB and LAH pattern following tetralogy of Fallot repair vary, with unclear prognostic implications.
Population
207 patients with tetralogy of Fallot operated at a single institution
Comparison
Patients with postoperative RBBB and LAH pattern vs others without this ECG pattern
Design
Cohort study
Follow-up
1-13 years (mean 6.2 years)
Authors
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Bifascicular block after tetralogy of Fallot repair was not associated with mortality or AV dissociation; hypothesis-generating and should not yet change practice.
Cohort (n=207)
No
Postoperative RBBB and LAH following tetralogy of Fallot repair may have a benign prognosis, likely depending on whether the lesions are in the bundle of His or the peripheral conduction system.
Steeg et al. (1975) conducted a cohort in Tetralogy of Fallot (n=207). Postoperative right bundle branch block (RBBB) and left anterior hemiblock (LAH) pattern was evaluated on Late atrioventricular dissociation, syncope, or mortality. Postoperative right bundle branch block and left anterior hemiblock occurred in 8.7% of 207 patients following tetralogy of Fallot repair, with no mortality or late AV dissociation over 6.2 years.
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