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P2 Outcomes in adults following anatomic repair of congenitally corrected transposition of the great arteries
  1. Sayqa Arif,
  2. Sarah Bowater,
  3. Paul Clift,
  4. Sara Thorne,
  5. Lucy Hudsmith
  1. Department of Cardiology and Adult Congenital Heart Disease, University Hospitals Birmingham NHS Trust, Birmingham, UK

Abstract

Introduction Anatomic repair (double switch operation) for congenitally corrected transposition of the great arteries (ccTGA) is associated with good short to mid-term outcomes. An increasing number of these patients are surviving to adulthood. There is a paucity of data in adults regarding late sequelae. We sought to determine the long-term outcomes in older patients who have previously undergone a double switch operation for ccTGA.

Methods A retrospective analysis of 16 patient records from 2001 to 2015 from a single institution was conducted. Median age was 23 years (range 18–56 years, 14 male). Six patients had undergone a Senning-arterial switch and 10 patients underwent a Rastelli-Senning procedure. Associated defects included VSD (n = 13), pulmonary stenosis (n = 2) and pulmonary atresia (n = 13). Three patients had undergone prior pulmonary artery banding and 7 patients systemic-pulmonary artery shunting. We determined freedom from re-operation/intervention, development of systemic left ventricular (LV) dysfunction, systemic mitral regurgitation, conduction disorders and arrhythmias.

Results Median follow-up was 19 years (18–21 years). Eleven patients required further surgery with 4 patients having undergone two subsequent operations. Following anatomic repair, median time to 1st operation was 11 years (7–13 years). Indications for re-operation included re-do RV-PA conduit in the Rastelli-Senning patients (n = 8) and aortic valve replacement in the Senning-arterial group (n = 3). 5 patients developed atrio-ventricular conduction block requiring a pacemaker. Three patients developed atrial arrhythmias, with 2 requiring ablation procedures. Six patients developed LV dysfunction. There were no deaths or need for cardiac transplantation in this series.

Conclusion The majority of patients required a second operation, largely in the Rastelli-Senning group. In the Senning-arterial group, late aortic valve insufficiency occurred in 50% of the patients. Conduction disease and atrial arrhythmias contribute to late morbidity in these patients. Nevertheless, the majority of patients are free of heart failure. Despite good short-term outcomes and survival following anatomic repair, careful long-term evaluation for structural and electrophysiological abnormalities is required.

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