Editor:We read with great interest the article "Magnetic Resonance Imaging of the Right Ventricle in Pediatric Pulmonary Arterial Hypertension" by Blalock et al.1 They present highly valuable cardiac magnetic resonance (CMR) data on children with idiopathic pulmonary arterial hypertension (IPAH) without a secondary cause of PAH, such as congenital heart disease (CHD
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