Fate of the right ventricle after fenestrated right ventricular exclusion for severe neonatal Ebstein anomaly

Schematic illustration of the parasternal short-axis view. The septal impingement ratio is calculated at the end-systolic phase and equals a/b values measured in the left ventricle (LV). Values approaching 1.0 indicate circular morphology, and values of less than 1.0 connote septal impingement. RV, Right ventricle.

Two-dimensional echocardiogram of the parasternal short axis. This is a preoperative view demonstrating septal impingement, with a/b approaching zero. RV, Right ventricle; LV, left ventricle.

Two-dimensional echocardiogram of the parasternal short axis. This is a pre-Glenn view demonstrating lack of septal impingement, with a/b approaching 1.0, suggesting normal morphology of the left ventricle (LV). RV, Right ventricle.