Echocardiographic characteristics of the study population, median (IQR). GoudjilSabrina ImestourenFatiha ArmougonAurelie RazafimanantsoaLucie MahmoudzadehMahdi WalloisFabrice LékéAndré KongoloGuy 2014 <p>(<b>‡</b>): Data only for patients with constrictive ductus; <b>V. ductus</b>, Maximal ductal flow velocity; <b>LPAV</b>, Mean left pulmonary artery flow velocity; <b>EDLPAV</b>, End diastolic left pulmonary artery flow velocity; <b>LA/Ao</b>, Left atria-to-Aorta diameter ratio; <b>IQR</b>, Interquartile interval; <b>T1</b>, the day of diagnosis by echocardiography; <b>T2</b>, the day after the end of treatment with ibuprofen. For patients in the Control group, T1: 1–3 day of life and T2: 4–6 days of life; paired comparison T1 vs T2 in the same infants, (<b>*</b>): p<0.05, (<b>**</b>): p<0.01.</p>