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- W2009938306 abstract "The development and regression of right ventricular hypertrophy was investigated in 12 pigs with special reference to changes in ventricular function and myocardial fiber orientation. Nine ventricles were pressure ‐loaded by banding the pulmonary artery for 28–81 days, and four of them were then released from the load by removing the band. Right ventricular systolic pressure (RVSP), end‐diastolic pressure (RVEDP) and end systolic volume index (ESVI) increased significantly during banding and decreased after debanding. End diastolic volume index (EDVI) and stroke volume index (SVI) showed no significant change during banding and after debanding. The weight of the right ventricle relative to both ventricles (RV/TV) and the thickness of muscle fibers were increased significantly in the loaded ventricles, and reduced again to the control level in ventricles released from the load. The intramyocardial distribution of angles ( θ ) of inclination of muscle fibers from the transverse plane of the outflow tract was estimated histometrically. There was a significantly larger proportion of circularly oriented fibers (|θ|≦30) in the pressure loaded ventricles than in the control, whereas these fibers decreased again to the control level after removal of the pressure load. The present findings indicates that 1) the right ventricular hypertrophy induced by pressure loading is characterized not only by an increase in ventricular weight and muscle fiber thickness, but also by a change in intramyocardial fiber orientation, and 2) the hypertrophic right ventricle can regress both functionally and morphologically to a normal state after removal of the pressure load." @default.
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- W2009938306 date "1990-06-01" @default.
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- W2009938306 title "Muscle Fiber Orientation in the Development and Regression of Right Ventricular Hypertrophy in Pigs" @default.
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- W2009938306 doi "https://doi.org/10.1111/j.1440-1827.1990.tb01579.x" @default.
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