Table 1 Baseline demographic, electrocardiographic and CMR parameters of the study subjects (n = 153)

Male

76 (50 %)

Body surface area (m²)

1.6 ± 0.4

Age at CMR (years)

23 ± 14

Age at surgical repair (years)

3.5 ± 6.7

Type of initial repair

 Transannular patch

97 (63 %)

 RV-PA conduit

11 (7 %)

 RVOT patch, non-transannular

30 (20 %)

 Infundibular resection & pulmonary valvotomy

2 (1 %)

 Pulmonary valvotomy alone

9 (6 %)

 Other

4 (3 %)

Electrocardiogram

 QRS duration (ms)

136 ± 27

 Heart rate (beats/min)

80 ± 17

CMR parameters

 Pulmonary regurgitation fraction (%)

36 ± 15

 Indexed LV end-diastolic volume (mL/m²)

85 ± 15 (-0.7 ± 1.6)

 Indexed LV end-systolic volume (mL/m²)

35 ± 9 (0.0 ± 1.6)

 LV ejection fraction (%)

59 ± 6 (-1.0 ± 1.3)

 Indexed RV end-diastolic volume (mL/m²)

143 ± 36 (2.6 ± 2.8)

 Indexed RV end-systolic volume (mL/m²)

67 ± 23 (3.2 ± 3.6)

 Indexed RV stroke volume (mL/m²)

76 ± 20 (1.7 ± 2.3)

 RV ejection fraction (%)

53 ± 8 (-1.0 ± 1.8)

 LV dyssynchrony (ms)

19 ± 11 (1.6 ± 2.1)

 RV dyssynchrony (ms)

57 ± 29 (0.6 ± 1.7)

 Inter-ventricular dyssynchrony (ms)^a

-40 ± 20 (-1.8 ± 0.7)

 LV circumferential strain (%)

27 ± 3 (-0.6 ± 1.0)

 RV circumferential strain (%)

18 ± 3 (1.2 ± 1.1)

 LV longitudinal strain (%)

19 ± 3 (-1.0 ± 1.2)

 RV longitudinal strain (%)

23 ± 3 (-0.7 ± 1.6)