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Pulmonary Arterial Resistance: Noninvasive Measurement with Indexes of Pulmonary Flow Estimated at Velocity-encoded MR Imaging-Preliminary Experience¹

¹ From the Department of Cardiovascular Radiology, Hôpital Broussais, 96 rue Didot, 75014 Paris, France (E.M., O.J., J.C.G.); Institut National de la Santé et de la Recherche Médicale (INSERM) U494, Centre Hospitalier Universitaire (CHU) Pitié-Salpêtrière, Paris, France (E.M., O.J.); Unité de Recherche Associée (URA), Centre National de la Recherche Scientifique (CNRS) 2212, Centre Iuter Etablissement de Résonance Magnétique (CIERM), Hôpital de Bicêtre, Le Kremlin Bicêtre, France (J.P.T., J.B.); and the Department of Respiratory Disease, Hôpital Antoine Béclère, Clamart, France (G.S.). From the 1998 RSNA scientific assembly. Received May 29, 1998; revision requested July 16; final revision received November 20; accepted February 22, 1999. Address reprint requests to E.M. (e-mail: mousseaux@hbroussais.fr).

Cardiac output and pulmonary vascular resistance (PVR) were measured in 19 patients by means of catheterization of the right side of the heart. Results were compared with the cardiac output and indexes of pulmonary arterial blood flow estimated with velocity-encoded magnetic resonance (MR) imaging. Correlations were good between estimates with right-sided heart catheterization and those with velocity-encoded MR imaging. By providing accurate pulmonary arterial blood flow measurements, velocity-encoded MR imaging allowed distinction of patients with high PVR from subjects with normal PVR.

Index terms: Hypertension, pulmonary, 564.78 • Magnetic resonance (MR), phase imaging, 564.12144 • Pulmonary arteries, abnormalities, 564.78 • Pulmonary arteries, flow dynamics, 564.78

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