Differential Effects of Isoproterenol on Regional Myocardial Mechanics in Rat Using Three-Dimensional Cine DENSE Cardiovascular Magnetic ResonanceSource: Journal of Biomechanical Engineering:;2019:;volume( 141 ):;issue: 006::page 60904Author:Zhang, Xiaoyan
,
Liu, Zhan-Qiu
,
Singh, Dara
,
Powell, David K.
,
Chung, Charles S.
,
Campbell, Kenneth S.
,
Wenk, Jonathan F.
DOI: 10.1115/1.4041042Publisher: American Society of Mechanical Engineers (ASME)
Abstract: The present study assessed the acute effects of isoproterenol on left ventricular (LV) mechanics in healthy rats with the hypothesis that β-adrenergic stimulation influences the mechanics of different myocardial regions of the LV wall in different ways. To accomplish this, magnetic resonance images were obtained in the LV of healthy rats with or without isoproterenol infusion. The LV contours were divided into basal, midventricular, and apical regions. Additionally, the midventricular myocardium was divided into three transmural layers with each layer partitioned into four segments (i.e., septal, inferior, lateral, and anterior). Peak systolic strains and torsion were quantified for each region. Isoproterenol significantly increased peak systolic radial strain and circumferential-longitudinal (CL) shear strain, as well as ventricular torsion, throughout the basal, midventricle, and apical regions. In the midventricle, isoproterenol significantly increased peak systolic radial strain, and induced significant increases in peak systolic circumferential strain and longitudinal strain in the septum. Isoproterenol consistently increased peak systolic CL shear strain in all midventricular segments. Ventricular torsion was significantly increased in nearly all segments except the inferior subendocardium. The effects of isoproterenol on LV systolic mechanics (i.e., three-dimensional (3D) strains and torsion) in healthy rats depend on the region. This region dependency is also strain component-specific. These results provide insight into the regional response of LV mechanics to β-adrenergic stimulation in rats and could act as a baseline for future studies on subclinical abnormalities associated with the inotropic response in heart disease.
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contributor author | Zhang, Xiaoyan | |
contributor author | Liu, Zhan-Qiu | |
contributor author | Singh, Dara | |
contributor author | Powell, David K. | |
contributor author | Chung, Charles S. | |
contributor author | Campbell, Kenneth S. | |
contributor author | Wenk, Jonathan F. | |
date accessioned | 2019-09-18T09:05:31Z | |
date available | 2019-09-18T09:05:31Z | |
date copyright | 4/22/2019 12:00:00 AM | |
date issued | 2019 | |
identifier issn | 0148-0731 | |
identifier other | bio_141_06_060904 | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4258755 | |
description abstract | The present study assessed the acute effects of isoproterenol on left ventricular (LV) mechanics in healthy rats with the hypothesis that β-adrenergic stimulation influences the mechanics of different myocardial regions of the LV wall in different ways. To accomplish this, magnetic resonance images were obtained in the LV of healthy rats with or without isoproterenol infusion. The LV contours were divided into basal, midventricular, and apical regions. Additionally, the midventricular myocardium was divided into three transmural layers with each layer partitioned into four segments (i.e., septal, inferior, lateral, and anterior). Peak systolic strains and torsion were quantified for each region. Isoproterenol significantly increased peak systolic radial strain and circumferential-longitudinal (CL) shear strain, as well as ventricular torsion, throughout the basal, midventricle, and apical regions. In the midventricle, isoproterenol significantly increased peak systolic radial strain, and induced significant increases in peak systolic circumferential strain and longitudinal strain in the septum. Isoproterenol consistently increased peak systolic CL shear strain in all midventricular segments. Ventricular torsion was significantly increased in nearly all segments except the inferior subendocardium. The effects of isoproterenol on LV systolic mechanics (i.e., three-dimensional (3D) strains and torsion) in healthy rats depend on the region. This region dependency is also strain component-specific. These results provide insight into the regional response of LV mechanics to β-adrenergic stimulation in rats and could act as a baseline for future studies on subclinical abnormalities associated with the inotropic response in heart disease. | |
publisher | American Society of Mechanical Engineers (ASME) | |
title | Differential Effects of Isoproterenol on Regional Myocardial Mechanics in Rat Using Three-Dimensional Cine DENSE Cardiovascular Magnetic Resonance | |
type | Journal Paper | |
journal volume | 141 | |
journal issue | 6 | |
journal title | Journal of Biomechanical Engineering | |
identifier doi | 10.1115/1.4041042 | |
journal fristpage | 60904 | |
journal lastpage | 060904-9 | |
tree | Journal of Biomechanical Engineering:;2019:;volume( 141 ):;issue: 006 | |
contenttype | Fulltext |