Differential branch pulmonary artery regurgitant fraction identifies patients with unilateral stenosis associated with relatively elevated pulmonary vascular resistance in the contralateral lung after repair of conotruncal anomalies

Repaired conotruncal anomaly pts may have residual branch pulmonary artery (BPA) stenosis or significant differences in the sizes of the BPAs. Phase-Contrast Magnetic Resonance (PCMR) can measure differential BPA regurgitation.