1066 Analysis of the systemic right ventricle (RV) in patients after atrial switch operation for the correction of complete transposition of great arteries (d-TGA) by MRI

Abstract

Results Compared to normal values (26 ± 5 g/m2) right ventricular muscle mass of MSO-patients (43.6 ± 16.2 g/m2) was significantly higher. The stroke volume of patients (33.8 ± 10.4 ml/m2) was significantly lower compared to controls (46 ± 8 ml/m2). The mean RV ejection fraction of patients (43,6 ± 9%) was also decreased (normal value: 43–63%). Patients with a stronger hypertrophy of the RV (>40 g/m2) had a significant higher ejection fraction and a significant lower enddiastolic volume than those with RV muscle mass within normal values (<40 g/m2) (Fig. 1). Comparing the RV (systemic ventricle) of patients and the LV of controls (systemic ventricle) a significant lower muscle mass was found in patients (43,6 ± 16,2 g/m2 vs. 87 ± 12 g/m2). We also found a significant lower ejection fraction (43,6 ± 9%) and a significant lower stroke volume (33,8 ± 10,4 ml/m2) in patients compared with controls.