BACKGROUND: Relationships between right ventricular (RV) and left ventricular (LV) shape and function may be useful in determining optimal timing for pulmonary valve replacement in patients with repaired tetralogy of Fallot (rTOF). However, these are multivariate and difficult to quantify. We aimed to quantify variations in biventricular shape associated with pulmonary regurgitant volume (PRV) in rTOF using a biventricular atlas. METHODS: In this cross-sectional retrospective study, a biventricular shape model was customized to cardiovascular magnetic resonance (CMR) images from 88 rTOF patients (median age 16, inter-quartile range 11.8-24.3 years). Morphometric scores quantifying biventricular shape at end-diastole and end-systole were computed using principal component analysis. Multivariate linear regression was used to quantify biventricular shape associations with PRV, corrected for age, sex, height, and weight. Regional associations were confirmed by univariate correlations with distances and angles computed from the models, as well as global systolic strains computed from changes in arc length from end-diastole to end-systole. RESULTS: PRV was significantly associated with 5 biventricular morphometric scores, independent of covariates, and accounted for 12.3% of total shape variation (p < 0.05). Increasing PRV was associated with RV dilation and basal bulging, in conjunction with decreased LV septal-lateral dimension (LV flattening) and systolic septal motion towards the RV (all p < 0.05). Increased global RV radial, longitudinal, circumferential and LV radial systolic strains were significantly associated with increased PRV (all p < 0.05). CONCLUSION: A biventricular atlas of rTOF patients quantified multivariate relationships between left-right ventricular morphometry and wall motion with pulmonary regurgitation. Regional RV dilation, LV reduction, LV septal-lateral flattening and increased RV strain were all associated with increased pulmonary regurgitant volume. Morphometric scores provide simple metrics linking mechanisms for structural and functional alteration with important clinical indices.

Auckland Bioengineering Institute University of Auckland Auckland New Zealand

Department of Anatomy and Medical Imaging University of Auckland Auckland New Zealand

Department of Biomedical Engineering King's College London London UK

Department of Cardiology Auckland District Health Board Auckland New Zealand

Department of Mathematics Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Prague Czech Republic

Division of Cardiology Rady Children's Hospital San Diego CA USA

Duke NUS Medical School Singapore Singapore

Inria Palaiseau France

LMS École Polytechnique CNRS Institut Polytechnique de Paris Palaiseau France

National Heart Centre Singapore Singapore

School of Computing University of Leeds Leeds UK

University of California San Diego La Jolla CA USA

University of Texas Southwestern Medical Centre Dallas TX USA

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