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The extracardiac conduit (ECC) modification of the Fontan procedure has been theorized to reduce the risk of sinus node dysfunction and atrial arrhythmia compared with the intra-atrial lateral tunnel (ILT) Fontan. This study aimed to compare the prevalence of early and late arrhythmias in patients who underwent ECC and ILT Fontan from a similar era with long-term follow-up at a single institution. A retrospective cohort study was conducted of all patients who underwent ECC or ILT Fontan from 1995 to 2005 at The Children's Hospital of Philadelphia. Bradyarrhythmias (including sinus node dysfunction), tachyarrhythmias, and pacemaker burden prevalence was determined throughout early (<30 days) and late (>30 days) postoperative periods. Of 434 patients undergoing the Fontan procedure during the study period, a total of 87 and 106 patients who underwent ECC and ILT Fontan, respectively, met the inclusion criteria. There were no significant differences in risk of sinus node dysfunction or tachyarrhythmia in both early and late postoperative periods. Although the overall risk of late postoperative pacemaker therapy was lower for the ECC cohort (4.9% vs 15.7%, p=0.03), when adjusting for follow-up time, no significant difference was observed (odds ratio 3.1, 95% confidence interval 0.6 to 15.2, p=0.16). In conclusion, the overall prevalence of late postoperative arrhythmias observed after contemporary Fontan modifications is low. Intra-atrial reentrant tachycardia, a potentially fatal complication of the atriopulmonary Fontan operation was infrequently encountered in both ECC and ILT Fontan cohorts. Pacemaker use was higher in the ILT group, although this difference may be explained by differences in follow-up time. Despite the low prevalence of arrhythmias after contemporary Fontan modifications, ongoing surveillance is warranted as the onset of arrhythmias may emerge after longer follow-up time., (Copyright © 2014 Elsevier Inc. All rights reserved.)

This study aimed to characterize the impact of race on morbidity and mortality after hospital discharge from neonatal congenital heart surgery. A retrospective chart review examined all the neonates who underwent neonatal heart surgery from January 2005 to June 2006 at The Children's Hospital of Philadelphia. After risk adjustment for the type of surgery using the Risk Adjustment for Congenital Heart Surgery 1 (RACHS-1) method, the association of race with mortality after hospital discharge was assessed using Fisher's exact test for statistical analysis. A cross-sectional telephone survey of surviving patients also was conducted to examine the association of race and social factors with adverse events (admissions or reinterventions). Mortality status was known for 201 of the 217 patients screened. The mortality rate after discharge was 8 %, with a higher mortality rate for nonwhite patients (14 %) than for white patients (4 %) (p = 0.01). After risk adjustment, this effect was limited to nonwhite patients with less complex heart disease (RACHS-1 categories 1-3; 17 vs 2 %, respectively; p = 0.01). The survey completion rate was 54 %. In this cohort, race also was independently associated with adverse events among patients with less complex heart disease (RACHS-1 categories 1-3; nonwhites 53 % vs whites 25 %; p = 0.046). Among the patients with less complex heart disease, the nonwhite patients had a significantly higher risk of morbidity and mortality after hospital discharge than the white patients.