On doppler echocardiogram, PDA diameter was 5.5 ± 0, 1 mm, systolic pulmonary pressure was 37.6 ± 1.7 mmHg), 57.3% had pulmonary arterial hypertension of which severe pulmonary arterial hypertension was 20.2%, left-to-right shunt occurred in 98.5%, bidirectionnal shunt occurred in 1.5%; 6.1% had low ejection fraction.