Atrioventricular septal defect in Fontan circulation: Right ventricular dominance, not valve surgery, adversely affects survival

Occluded fenestration is associated with improved long-term outcomes in patients undergoing the fenestrated Fontan operation

OBJECTIVE

The modified Fontan operation, a palliative approach for patients with single ventricular circulation, often incorporates a fenestration to facilitate postoperative management. Postoperative fenestration closure sometimes is performed to mitigate potential risks such as low oxygen saturation. However, the benefits and potential risks of this procedure remain under investigation.

METHODS

A retrospective, propensity score-matching study was conducted at the National Taiwan University Children's Hospital. It included all patients who underwent their first fenestrated modified Fontan procedure between February 1998 and July 2020. The primary objective was to assess the incidence of death, Fontan takedown, and heart transplantation. Major adverse cardiovascular events were considered as a secondary outcome.

RESULTS

The study comprised 173 patients (male/female 100/73), with a median operation age of 4.6 years and a median follow-up of 10.4 years (interquartile range, 6.2-14.0 years) after operation. At the latest follow-up, fenestration was occluded in 74 patients (42.8%), with 29 undergoing transcatheter closure and 45 experiencing spontaneous occlusion. After propensity score matching, patients with occluded fenestration demonstrated significantly better event-free survival (15-year survival 95.3% vs 78.6%, P = .047), although the intention-to-treat fenestration closure group showed similar outcomes compared with the natural course group. High recent N-terminal pro-B-type natriuretic peptide and Fontan pressure emerged as critical risk factors for worse event-free survival and major adverse cardiovascular events. The cutoff points of N-terminal pro-B-type natriuretic peptide and Fontan pressure were 467.7 pg/mL and 18 mm Hg, respectively.

CONCLUSIONS

Patients with occluded fenestration exhibited superior event-free survival. Fenestration closure is a feasible strategy to enhance oxygen saturation without elevating Fontan pressure.

Tricuspid Valve Repair Can Restore the Prognosis of Patients with Hypoplastic Left Heart Syndrome and Tricuspid Valve Regurgitation: A Meta-analysis

To date, evidence supporting the efficacy of tricuspid valve (TV) repair in interrupting the progression of systemic right ventricular (RV) adverse remodeling in hypoplastic left heart syndrome (HLHS) is conflicting. We conducted a systematic review and meta-analysis of scientific literature to assess the impact of TV repair in effectively modifying the prognosis of patients with HLHS. We conducted a systematic review of PubMed, Web of Science, and Scopus databases. A random-effect meta-analysis was performed and transplant-free survival, freedom from TV regurgitation, and TV reoperation data were reconstructed using the published Kaplan-Meier curves. Nine studies were included, comprising 203 HLHS patients undergoing TV repair and 323 HLHS controls. The estimated transplant-free survival at 1, 5, and 10 years of follow-up was 75.5% [95% confidence interval (CI) = 67.6-84.3%], 63.6% [95% CI = 54.6-73.9%], and 61.9% [95% CI = 52.7-72.6%], respectively. Transplant-free survival was comparable to HLHS peers without TV regurgitation (p = 0.59). Five-year freedom from recurrence of TV regurgitation and freedom from TV reoperation was 57% [95% CI = 46.7-69.7%] and 63.6% [95% CI = 54.5-74.3%], respectively. Younger age and TV repair at the time of Norwood operation increased the risk of TV regurgitation recurrence and the need for TV reoperation. Our meta-analysis supports the efficacy of TV repair in favorably modifying the prognosis of patients with HLHS and TV regurgitation, reestablishing a medium-term transplant-free survival which is comparable to HLHS peers. However, durability of surgery and long-term fate of TV and RV performance are still unclear.

Early and long-term outcomes following cardiac surgery for patients with heterotaxy syndrome

Objective

Heterotaxy syndrome is a complex multisystem abnormality historically associated with high morbidity and mortality. We sought to evaluate the early and long-term outcomes after cardiac surgery in heterotaxy syndrome.

Methods

This is a single-center retrospective review of patients with heterotaxy syndrome undergoing single-ventricle palliation or primary or staged biventricular repair from 1998 to 2018. Patients were stratified by single ventricle versus biventricular physiology, and the severity of atrioventricular valve regurgitation. Demographics, anatomic characteristics, and early and late outcomes, including the length of stay, mortality, and surgical or catheter reinterventions, were analyzed.

Results

Among 250 patients, 150 (60%) underwent biventricular repair. In-hospital mortality was 7.6% (n = 19). Median follow-up was 5.2 (range, 0-16) years. Among survivors to discharge, mortality was 19% (n = 44) and reintervention was 52% (n = 120). Patients with moderate/severe atrioventricular valve regurgitation were older (32 vs 16 months, P = .02), were more likely to experience adverse events during their index surgical admission (72% vs 46%, P < .001), and had longer in-hospital length of stay (20 vs 12 days, P = .009). Among patients with moderate to severe atrioventricular valve regurgitation, single-ventricle palliation is associated with a greater risk of unplanned reintervention compared with patients undergoing biventricular repair (hazard ratio, 2.13; CI, 1.10-4.12; P = .025).

Conclusions

There was no significant difference in early or late outcomes in single-ventricle versus biventricular repair strategies in heterotaxy. In the subgroup of patients with moderate/severe atrioventricular valve regurgitation, patients who underwent single-ventricle palliation were 2.5 times more likely to need a late reintervention compared with those undergoing biventricular repair.