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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.
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Simpkin et al. (2026) studied this question.
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