Shape Variations in RV 3D Geometry Are Associated With Adverse Outcomes in Hypoplastic Left Heart Syndrome Patients: A Fontan Outcomes Registry Using CMR Examination (FORCE) Study

Authors

Yue-Hin Loke, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Ryan O'Hara, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Jacqueline Contento, Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., J.C., S.A.).
Nicole Marella, Department of Pediatrics, Rutgers University, New Brunswick, NJ (N.M.).
Sarah Kollar, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Ravi Vegulla, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Susana Gaviria, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Rittal Mehta, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Elias Balaras, Department of Mechanical and Aerospace Engineering, George Washington University, DC (E.B.).
Alix Fetch, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Yves d'Udekem, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Tarek Alsaied, UPMC Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, PA (T.A., L.O.).
Laura Olivieri, UPMC Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, PA (T.A., L.O.).
Uyen Truong, Department of Cardiology, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., S.K., R.V., S.G., R.M., A.F., Y.d., U.T.).
Syed Anwar, Sheikh Zayed Institute for Pediatric Surgical Innovation, Children's National Hospital, Washington, DC. (Y.-H.L., R.H., J.C., S.A.).
Rahul H. Rathod, Department of Cardiology, Boston Children's Hospital, MA (R.H.R.).
Francesco Capuano, Department of Fluid Mechanics, Universitat Politècnica de Catalunya, BarcelonaTech, Spain (F.C.).

Document Type

Journal Article

Publication Date

11-5-2025

Journal

Circulation. Cardiovascular imaging

DOI

10.1161/CIRCIMAGING.125.018455

Keywords

catheterization; heart defects, congenital; heart ventricles; hypoplastic left heart syndrome; tricuspid valve insufficiency

Abstract

BACKGROUND: Assessment of the systemic right ventricle (RV) is critical for patients with hypoplastic left heart syndrome (HLHS). Traditional imaging metrics fail to capture the RV's complex geometry and remodeling in HLHS, limiting risk stratification. We aimed to apply statistical shape modeling to a large multicenter cohort of cardiac magnetic resonance data sets to define RV shape variants and evaluate associations with clinical outcomes. METHODS: Cardiac magnetic resonance from the FORCE (Fontan Outcomes Registry Using CMR Examinations) was analyzed for patients with HLHS post-Fontan. Three-dimensional RV models were segmented at end-diastole and processed using statistical shape modeling (ShapeWorks). Shape modes were extracted via principal component analysis and correlated with RV function, tricuspid regurgitation, remnant left ventricular morphology, and clinical outcomes, including mortality, transplant, and a composite adverse outcome including heart failure. RESULTS: The mean RV shape template of 329 patients with HLHS (mean age, 14.7±6.3 years) depicted a circumferentially dilated RV with loss of septal concavity. RV end-diastolic volume was independently associated with composite adverse outcome (odds ratio, 6.50; P=0.001). Distinct shape modes were identified, including an apical bulge phenotype that was independently associated with composite adverse outcome (odds ratio, 2.45; P=0.047) and mortality/transplant (odds ratio, 4.24; P=0.004). This variant also correlated with RV dilation, hypertrophy, and impaired regional strain. A spheroidal shape was associated with ≥moderate tricuspid regurgitation and tricuspid annular dilation. Remnant left ventricular morphology influenced RV shape and function but not transplant-free survival. CONCLUSIONS: Our statistical shape modeling analyses provide novel insights into RV geometric remodeling in HLHS and identify specific shape phenotypes associated with dysfunction and adverse outcomes. Shape-based metrics offer additive prognostic value beyond conventional volumetric analysis, with potential implications for risk stratification and surgical decision-making in single-ventricle physiology.

APA Citation

Loke, Yue-Hin; O'Hara, Ryan; Contento, Jacqueline; Marella, Nicole; Kollar, Sarah; Vegulla, Ravi; Gaviria, Susana; Mehta, Rittal; Balaras, Elias; Fetch, Alix; d'Udekem, Yves; Alsaied, Tarek; Olivieri, Laura; Truong, Uyen; Anwar, Syed; Rathod, Rahul H.; and Capuano, Francesco, "Shape Variations in RV 3D Geometry Are Associated With Adverse Outcomes in Hypoplastic Left Heart Syndrome Patients: A Fontan Outcomes Registry Using CMR Examination (FORCE) Study" (2025). GW Authored Works. Paper 8137.
https://hsrc.himmelfarb.gwu.edu/gwhpubs/8137

Department

Pediatrics