Magnetic resonance imaging (MRI) was used to examine the right ventricle and pulmonary arteries in 17 @entity1 with pulmonary artery (PA) @entity101 documented by cardiac catheterization. The study population consisted of 7 @entity1 with @entity120 , 7 with @entity6924 and 3 with @entity120 secondary to @entity358 . The MRI studies of @entity1 were compared with those of 10 normal volunteers. Multislice gated transaxial images encompassed the right ventricle and central pulmonary arteries, showing the severity of right ventricular (RV) @entity1184 in proportion to the elevation of PA pressure and reversal of septal curvature when PA pressure approximated systemic pressure. End-diastolic RV wall thickness and mean pulmonary pressure correlated well (r = 0.79). MRI showed enlargement of PAs in all @entity1 with PA @entity101 . A magnetic resonance signal was present in the PAs throughout the cardiac cycle in @entity1 with severe PA @entity101 (more than 90 mm Hg) and was absent during systole in normal subjects. A signal within the PAs in systole is consistent with decreased flow velocity in @entity1 with severe PA @entity101 . MRI was useful in detecting each of the congenital anatomic defects in @entity1 with @entity6924 . This study indicates the potential of MRI for evaluating the severity of PA @entity101 by providing direct measurements of RV wall thickness and PA diameter and by detecting abnormal intraluminal signal intensity during the cardiac cycle.

Magnetic resonance imaging in XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity101 :: ('MESH:D006973', 'Disease') :: ['hypertension'] @entity1184 :: ('MESH:D006984', 'Disease') :: ['hypertrophy'] @entity120 :: ('MESH:D006976', 'Disease') :: ['pulmonary hypertension', 'primary pulmonary hypertension'] @entity358 :: ('MESH:D008171', 'Disease') :: ['lung disease'] @entity6924 :: ('MESH:D004541', 'Disease') :: ["Eisenmenger's syndrome"]
@entity120 :: (MESH:D006976,Disease) :: ['pulmonary arterial hypertension']
