Targeted Flow Cardiac Magnetic Resonance Imaging in Neonates with Intracardiac Shunts: A Novel Multimodality Imaging Approach to Hemodynamic Assessment.

Distinguishing the relative contributions of pulmonary vascular resistance and intracardiac shunts to elevated right-heart pressures in infants remains challenging when relying on clinical assessment and echocardiography. We describe our initial experience implementing cardiac magnetic resonance imaging to measure the pulmonary-to-systemic flow ratio noninvasively using no, minimal, or baseline sedation in infants with possible pulmonary hypertension.