Modern tetralogy of Fallot repairs show zero deaths through 16 years of follow-up

Among 95 patients who underwent repair between 2000 and 2015, there were no deaths at all during the study period, and the children reached adolescence with normal weight, height, and body mass index at 16 years of age.

The research team, led by Bitterman and colleagues, assembled a single-center retrospective cohort at the quaternary referral hospital, enrolling children who had undergone either a standard tetralogy of Fallot repair or a repair of the double outlet right ventricle tetralogy of Fallot type between 2000 and 2015. The authors excluded patients with comorbidities or genetic abnormalities that would limit life expectancy or exercise tolerance, except for 22q11.2 deletion. They also excluded patients whose estimated right ventricular systolic pressure exceeded half the systemic pressure.

What sets this study apart from the historical literature is the intensity and standardization of follow-up. Patients underwent serial assessments, including echocardiography, electrocardiograms, Holter monitoring, metabolic exercise testing, and cardiovascular magnetic resonance imaging. These assessments were performed both pre-operatively and at two-yearly intervals until the last clinical follow-up or until reaching 18 years of age. The mean age at repair in the cohort was six months, which aligns with the 2022 American Association for Thoracic Surgery guidelines recommending complete surgical correction between three and six months of age in asymptomatic infants. Those same guidelines also endorse valve-sparing approaches and consider palliative procedures reasonable for high-risk infants, recommendations that were far less standardized when the older outcome data were collected.

The survival picture was unambiguous. Not a single patient died throughout the duration of the study, a result the commentary authors describe as evidence of a relatively benign period in the natural history of repaired tetralogy of Fallot, one that precedes the later sequelae seen in adulthood. Growth was equally reassuring, with the children showing normal weight, height, and BMI when assessed at 16 years of age.

That reassurance comes with important qualifications, however, because the heart does not always behave perfectly after repair. In the post-repair period, three patients developed ectopic atrial tachycardia, four experienced non-sustained ventricular tachycardia, and one developed atrioventricular block.

The electrocardiographic trajectory offered one genuinely encouraging signal. QRS duration, measured as a z-score adjusted for age, was similar when the children were assessed at 8 years and again at 18 years of age.

Exercise data told a more nuanced story. Between the ages of 8 and 18, exercise capacity declined significantly, even as peak workload increased significantly over the same interval.

Surgical technique mattered for the right ventricle. Patients who underwent a valve-sparing repair had lower pulmonary insufficiency, lower right ventricular end-diastolic volume, and lower right ventricular end-systolic volume compared with those who received a non-valve-sparing repair. Yet the two groups were comparable in right ventricular ejection fraction, left ventricular ejection fraction, and peak aerobic capacity, measured as VO2.

They identify the study’s strengths as its contemporary cohort dedicated to pediatric ages, which reduces the era-dependent heterogeneity that complicates older literature, and its use of guideline-based, multifactorial assessments of cardiovascular function focused on physiological change. At the same time, they note that the single-center retrospective design limits generalizability to other surgical centers, and the cohort of 95 individuals is significantly smaller than in prior studies, which constrains statistical power. The median follow-up of 15.7 years provides only partial information on the natural history of the repaired heart and does not capture longer-term outcomes such as sudden cardiac death and the arrhythmias that emerge as later sequelae.

There is also a methodological caveat about the markers themselves. The cardiorespiratory measures used in the study, including ejection fraction and VO2, are currently employed as predictor variables in risk stratification scores for patients with repaired tetralogy of Fallot, but they have not yet been individually validated as clinical endpoints. The commentary argues that if these predictor markers were validated and tracked over time, functional decline could eventually serve as a surrogate endpoint to guide clinical decisions based on prognostic value, potentially supporting earlier and more intensive surveillance so that medical interventions could occur before overt complications develop. The American Heart Association has prioritized improving late outcomes precisely because the population of adolescents and adults living with a repaired heart has grown as infant survival has improved.

Subject of Research: Long-term childhood outcomes after modern-era surgical repair of tetralogy of Fallot

Article Title: Childhood tetralogy of Fallot repair outcomes in the modern era

Article References: Li, J. R. A., & Shivanna, B. (2026). Childhood tetralogy of Fallot repair outcomes in the modern era. Pediatric Research. https://doi.org/10.1038/s41390-026-05605-0

Image Credits: AI Generated

DOI: 10.1038/s41390-026-05605-0

Keywords: tetralogy of Fallot, congenital heart disease, pediatric cardiology, surgical repair, pulmonary valve replacement, ventricular arrhythmias, exercise capacity, right ventricular function, cardiac MRI, QRS duration, valve-sparing repair, long-term outcomes