462 Oral communications regression, three stable, three moderate), 16 PG (four regression, four stable, four moderate), 17 LAVVR (six regression, seven stable, four moderate). Image quality of micro-TEE was scored 1 for 2D and 2 for Doppler. In three patients on circulatory assistance, micro-TEE could be performed in PICU with good tolerance and acceptable quality. Conclusions.— TEE is a tool to evaluate hemodynamic signiﬁcance of post-operative residual lesions. This new microprobe offers the possibility to perform TEE in small infants in the OR and in unstable patients with poor imaging TTE in PICU. http://dx.doi.org/10.1016/j.acvd.2013.06.006 03 Coronary artery compression during transcatheter right-ventricular outﬂow tract treatment: Incidence, diagnosis and outcome Alain Fraisse a,e , Anass Assaidi a,e , Sophie Malekzadeh-Milani b,c,e , Mehul Patel b,c,e , Damien Bonnet b,d,e , Younes Boudjemline b,c,d,e a Cardiologie Pédiatrique, Hôpital de la Timone-Enfants, 264, rue St-Pierre, 13385 Marseille Cedex 05, France b Centre de Référence Malformations Cardiaques Congénitales Complexes (M3C), Necker Hospital for Sick Children, Assistance Publique des Hôpitaux de Paris, Pediatric Cardiology, Paris, France c Centre de Référence Malformations Cardiaques Congénitales Complexes (M3C), George-Pompidou European Hospital, Assistance Publique des Hôpitaux de Paris, Unit for Adults with congenital heart defects, Paris, France d Université Paris Descartes, Sorbonne Paris Cité, Paris, France e Hospital Bordeaux, Unit for children and Adults with congenital heart defects, Bordeaux, France Background.— Coronary compression (CC) may occur during per- cutaneous pulmonary valve implantation (PPVI) and is potentially life threatening when undiagnosed before right ventricular outﬂow tract (RVOT) stenting. We sought to evaluate its incidence, diagnosis and outcome. Methods.— All consecutive patients who underwent transcatheter RVOT treatment from May 2008 to December 2011 in two institutions were studied. Baseline demographics, diagnosis and outcomes of CC were reviewed with analysis of risk factors. Results.— CC occurred in six out of 100 patients (6%) at a median age of 24 (13 to 49) years, with RVOT conduit stenosis as the primary lesion in all cases. The initial congenital heart disease was pulmonary atresia-ventricular septal defect (n = 3), complex transposition of the great arteries (n = 2) and critical aortic steno- sis status-post Ross operation (n = 1). The RVOT initial median conduit diameter at surgical implantation was 23 (17 to 24) mm and conduit types were homograft (n = 3), bioprothesis (n = 2) and a pericardial patch (n = 1). CC was diagnosed by coronary angiogram during balloon dilation of the RVOT in all cases whereas it was suspected on pre-procedure computed tomography (CT-scan) in only two cases. Compression occurred on the left anterior des- cending coronary artery in four cases and on a right coronary artery that arose from the proximal left anterior descending coro- nary artery in two patients (single coronary artery). No risk factor was found but there was a signiﬁcantly higher incidence of CC in one of the two institutions (P = 0.04). CC was well-tolerated and resolved after the balloon was deﬂated in all the cases. No patients underwent RVOT stenting or PPVI. Surgical conduit replace- ment was electively performed in three patients. Two patients with moderate residual RVOT stenosis are followed. One patient with encephalopathy and respiratory insufﬁciency died 9 months after catheterization. Conclusions.— CC is efﬁciently diagnosed by coronary angiogram during balloon dilation in patients undergoing transcatheter interventions on RVOT. Diagnosis by pre-procedure CT-scan is not accurate. No speciﬁc risk factors exist. Surgical conduit replacement is indicated when balloon dilation fails to improve the RVOT obstruction. http://dx.doi.org/10.1016/j.acvd.2013.06.007 04 The inﬂuence of closure of patent ductus arteriosus on left and right ventricular size and function Laurianne Le Gloan a , Jean-Benoît Thambo b , Julie Chabaneix b , Jean-Marc Langlard a , Véronique Gournay a , Cécile Pascal a , Bénédicte Romefort a , Quentin Hauet a , Nadir Benbrik a , Olivier Baron a , Patrice Guérin a a Institut du thorax, University hospital of Nantes, Nantes, France b Service des cardiopathies congénitales de l’enfant et de l’adulte, University hospital of Bordeaux, Bordeaux-Pessac, France Background.— Patent ductus arteriosus is responsible for left ven- tricular diastolic and right ventricular systolic overload. Little is known about hemodynamic changes after percutaneous and surgical closure. Methods.— We conducted a bicentric prospective study, of chil- dren, with patent ductus arteriosus, evaluating the evolution of systolic and diastolic ventricular function before, 1 day and 1 month after successful closure, by means of transthoracic echocardiography. Results.— Thirty-three children, age 3 months to 14.5 years, under- went successful closure of their patent ductus arteriosus, 32 percutaneously and one surgically. All patent ductus arteriosus were closed for hemodynamic reasons, with a mean diame- ter of 3.6 ± 0.9 mm. There was a signiﬁcant increase in systolic (100.6 ± 15.1 versus 95.4 ± 15.3 mmHg, P < 0.05) and diastolic (53.2 ± 17.1 versus 47.8 ± 17.2 mmHg, P < 0.05) blood pressures, immediately after the suppression of the shunt. Left ventricu- lar fractional shortening and end-diastolic volumes index were signiﬁcantly lower the day after closure (respectively 34.7 ± 5.5 versus 37.8 ± 4.7% and 47 ± 16.2 versus 54.6 ± 20.1 mL/m 2 ) and remained low compared to the preclosure state at follow-up (respectively 33.8 ± 5.4 versus 37.8 ± 4.7% and 47 ± 12.7 versus 54.6 ± 20.1 mL/m 2 ). A non-signiﬁcant decrease in left ventricular ﬁlling pressures was observed. Right ventricular systolic parameters (TAPSE) were signiﬁcantly lower 1 month after closure (19.3 ± 2.9 versus 21.4 ± 4.4 mm, P < 0.05). Conclusion.— Changes in left ventricular volume and function and in right ventricular function occur immediately after patent duc- tus arteriosus closure, and remain at 1 month of follow-up. Further studies are warranted to increase the number of patients and the duration of follow-up. http://dx.doi.org/10.1016/j.acvd.2013.06.008 05 A 10-year study of planned delivery of foetuses with prenatally diagnosed congenital heart disease in a single institution M. Bensemlali a,b , F. Raimondi a,b , L. Fermont a,b , J. Le Bidois a,b , L. Salomon a,b , D. Bonnet a,b a M3C-Necker Enfants maladies, AP—HP, Université Paris Descartes, Sorbonne Paris Cité, Paris, France b Maternité, Necker-Enfants maladies, AP—HP, Université Paris Descartes, Sorbonne Paris Cité, Paris, France Objectives.— To describe the aims and rationale for planned deliv- ery in a tertiary referral centre for foetuses with prenatal diagnosis of congenital heart disease. Methods and results.— Two thousand one hundred and thirty con- secutive foetuses with congenital heart disease diagnosed from © 2021 Elsevier Masson SAS. 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