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Methods 12 patients, who underwent percutaneous pulmonary valve implantation (PPVI) for significant RVOT obstruction (echo gradient > 50 mmHg), were included. MRI was performed at rest and during supine exercise stress at the same intensity preand within 1 month post-PPVI. Biventricular volumes and function were assessed under free breathing and continuation of exercise using a radial k-t SENSE real-time sequence. Pulmonary regurgitation fraction was calculated as follows: RV stroke volume (SV) LV SV.

journal of cardiovascular magnetic resonance

Percutaneous pulmonary valve implantation in right ventricular outflow tract dysfunction enhances cardiac response to exercise by improved bi-ventricular stroke volume-a exercise stress real-time magnetic resonance study