Value of preoperative echocardiography for the diagnosis of coronary artery patterns in neonates with transposition of the great arteries.

BACKGROUND: Abnormal coronary pattern may complicate coronary transfer during arterial switch operation. OBJECTIVE: To evaluate the accuracy of echocardiography in assessing the anatomy of coronary arteries in neonates with transposition of the great arteries, and determine impact on outcomes. METHODS: We conducted a retrospective analysis of data in neonates with transposition of the great arteries. Preoperative echocardiographic coronary artery pattern and surgical intraoperative reports were compared. Mismatch between transthoracic echocardiography and surgical intraoperative reports and the impact on perioperative outcome were assessed. Coronary patterns were classified into four groups: type 1 (normal); type 2 (risk of coronary with intramural course); type 3 (coronary loop); and type 2+3. RESULTS: Overall, 108 neonates who underwent an arterial switch operation were included: 68 were classified as type 1; seven as type 2; 32 as type 3; and one as type 2+3. Overall, 10 adverse events occurred. Five patients died, three from coronary causes. Survival was 96% at 1 month. Transthoracic echocardiography and surgical intraoperative reports differed in 17.6% of cases. Mortality was 15.8% in case of inappropriate diagnosis and 2.2% for appropriate diagnosis (P=0.01). Mortality in type 2 was 66.7% in case of discordance versus 0% when concordant. Multivariable analysis found that inappropriate preoperative transthoracic echocardiography diagnosis of coronary pattern was the only significant risk factor for mortality (P=0.04). CONCLUSIONS: Echocardiography can assess coronary artery anatomy in neonates with transposition of the great arteries. Intramural coronary course is often misdiagnosed. Preoperative misdiagnosis of coronary artery anomaly may impact perioperative mortality. However, this assessment will have to be confirmed by further larger studies.

A Case of Trisomy 13 Mosaicism Presenting with a Severe Aortic Root Dilatation and Marfanoid Habitus due to an Unpredictable Cytogenetic Mechanism.

In this report, we present a new case of mosaic trisomy 13 with prolonged survival, firstly detected by array-CGH analysis which was carried out because of moderate intellectual disability with postaxial hexadactyly, dermatologic features, ventricular septal defect, bicuspid aortic valve, and aortic dystrophy in a 19-year-old male patient. In a subset of 15% of the cells, the patient carried a derivative chromosome 10 generated by a nonreciprocal (10;13) translocation inherited from his healthy mother who carried the translocation in a balanced and homogeneous state. FISH analyses showed interstitial telomeric sequences at the breakpoints. To our knowledge, this is the second report of a patient with trisomy 13 mosaicism displaying a severe aortic root dilatation. We also discuss the mechanisms which could explain the mosaic state, the most likely one being related to the instability of the interstitial telomere.

Outcomes of Newborns with Prenatal Ventricular Asymmetry not Requiring Neonatal Surgical Intervention: a 22-Year Retrospective Single-Center Study.

To assess the outcomes of neonates prenatally diagnosed with ventricular asymmetry and not operated on within the neonatal period and to determine the risk factors for left heart obstruction occurrence at follow-up. All neonates with prenatal asymmetry of the ventricles, diagnosed from August 1993 to July 2015, not operated on within the neonatal period, were retrospectively included in the study. Left heart echocardiographic measurements at birth and at last follow-up were collected and compared. Left heart anomaly included isthmus and/or aortic valve and/or mitral valve obstruction. There were a total of 34 newborns included in the study. The median follow-up was 2 years. There was no death. Eleven patients were operated on at a median age of three months; seven of them had an obstruction of the left heart (five coarctations of the aorta, one sub-aortic and aortic valve stenosis, and one mitral stenosis). Estimated freedom of left heart surgery was 80% at 6 months and 75% at 10 years. The main risk factor for progression to a left heart anomaly was a hypoplasia of the aortic isthmus (p = 0.0003), while the presence of a left superior vena cava was more frequent in these patients although the difference was not significant. Patients with an aortic isthmus z-score below - 2 at the closure of arterial duct are at risk of later coarctation and therefore follow-up should be extended to at least 3 months. Furthermore, the prenatal ventricular asymmetry does not only identify patients at risk of coarctation but also of other left heart anomalies. This last point should be a better approach with future parents to improve prenatal counseling on a more complex postnatal diagnostic than a simple isolated coarctation.