Atlas-Based Ventricular Shape Analysis for Understanding Congenital Heart Disease

Area of Science:

• Cardiology
• Medical Imaging
• Biomedical Engineering

Background:

• Congenital heart disease (CHD) is linked to abnormal ventricular shape, impacting cardiac function and long-term outcomes.
• Understanding ventricular geometry and mechanics is crucial for managing single-ventricle physiology, such as in tricuspid atresia and Fontan procedures.

Purpose of the Study:

• To quantify ventricular geometry and wall motion abnormalities in CHD patients using atlas-based shape analysis.
• To explore relationships between altered ventricular shape and myocardial wall motion in CHD.
• To assess the potential of shape analysis as a tool for CHD patient management.

Main Methods:

• Parametric shape analysis of ventricular geometries from eight adolescent/adult single-ventricle CHD patients.
• Comparison of patient geometries against an atlas of asymptomatic volunteers to derive z-scores quantifying deviations.
• Correlation of shape analysis scores with clinical functional parameters and physician observations.

Main Results:

• Atlas-based shape analysis identified specific, quantifiable abnormalities in ventricular geometry and wall motion in all CHD subjects.
• Significant relationships were found between increased ventricular sphericity and decreased long-axis wall motion.
• The study demonstrated the potential to link specific shape alterations to functional deficits.

Conclusions:

• Atlas-based ventricular shape analysis is a promising tool for characterizing geometric and functional abnormalities in CHD.
• This technique can identify relationships between shape and wall motion, reflecting underlying pathophysiology and remodeling.
• Shape analysis may aid in the clinical management of CHD patients at risk for impaired ventricular mechanics.