4D cardiovascular magnetic resonance velocity mapping of alterations of right heart flow patterns and main pulmonary artery hemodynamics in tetralogy of Fallot
作者： Christopher J François , Shardha Srinivasan , Mark L Schiebler , Scott B Reeder , Eric Niespodzany
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摘要: To assess changes in right heart flow and pulmonary artery hemodynamics patients with repaired Tetralogy of Fallot (rTOF) we used whole heart, four dimensional (4D) velocity mapping (VM) cardiovascular magnetic resonance (CMR). CMR studies were performed 11 subjects rTOF (5M/6F; 20.1 ± 12.4 years) 10 normal volunteers (6M/4F; 34.2 13.4 on clinical 1.5T 3.0T MR scanners. 4D VM-CMR was using PC VIPR (Phase Contrast Vastly undersampled Isotropic Projection Reconstruction). Interactive streamline particle trace visualizations the superior inferior vena cava (IVC SVC, respectively), atrium (RA), ventricle (RV), (PA) generated reviewed by three experienced readers. Main PA net flow, retrograde peak time-to-peak acceleration, resistance index mean wall shear stress quantified. Differences patterns between two groups tested Fisher's exact test. quantitative parameters analyzed Kruskal-Wallis rank sum successfully all TOF. Right characterized (a) greater SVC/IVC during diastole than systole, (b) increased vortical RA RV diastole, (c) helical or features PA's. main index, acceleration statistically significant. Whole enables detection both abnormal patterns, which may allow for comprehensive to evaluate interdependencies post-surgically altered geometries hemodynamics.
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