Abstract
This study evaluated the effects of beta blockers (carvedilol and metoprolol XL) on New York Heart Association functional class and systemic right ventricular (RV) function in patients with complete transposition of the great arteries who had systemic RV dysfunction late after atrial inflow correction. A significant improvement in New York Heart Association functional class was found after 4 months of therapy with beta blockers. Functional recovery was significant mostly in those patients with pacemakers who received higher maintenance doses of carvedilol. RV end-diastolic area was significantly greater in untreated patients at the end of the follow-up period, whereas it was unchanged in treated patients. In conclusion, beta blockers prevent RV remodeling, with a concomitant improvement in exercise tolerance in patients with complete transposition of the great arteries and systemic RV dysfunction.
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