Scopus Publication Detail
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Passive ventricular constraint to improve left ventricular function and mechanics in an ovine model of heart failure secondary to acute myocardial infarction
James J. Pilla; Aaron S. Blom; Daniel J. Brockman; Victor A. Ferrari; Qing Yuan; Michael A. Acker; Juan Carlos Chachques; Stephen Westaby(Profiled Author: Qing Yuan)
Journal of Thoracic and Cardiovascular Surgery. 2003;126(5):1467-1476.Abstract
Objective: This study investigated the effects on global cardiac function and myocardial energetics of limiting progressive dilatation after infarction by means of a woven polyester jacket cardiac support device. We hypothesized that placement of the cardiac support device results in a decrease in myocardial wall stress and improvement in cardiac function and myocardial energetics. Methods: To investigate the effect of passive constraint on left ventricular function and mechanics, a total of 10 sheep were studied with pressure-volume analysis and magnetic resonance imaging. A baseline study was followed by the creation of an anterior infarct. After 1 week, the animals underwent a second study. The cardiac support device was then placed over the epicardium in 5 sheep; the remaining animals served as controls. A terminal study was performed at 2 months after the infarct. Results: The cardiac support device group at the terminal study exhibited a decrease in end-diastolic volume (control 110.3 ± 19.8 mL vs cardiac support device 67.6 ± 4.7 mL, P = .006) and an improved ejection fraction (control 15.5% ± 5.7% vs cardiac support device 29.46% ± 4.42%, P = .008) relative to the control group. Myocardial energetics were also enhanced in the cardiac support device group, as evidenced by the significant improvements in potential energy (control 2015 ± 503 mL · mm Hg/beat vs cardiac support device 885 ± 220 mL · mm Hg/beat, P = .006), efficiency (control 39.4% ± 13.6% vs cardiac support device 59.8% ± 8.5%, P = .044), and oxygen consumption (control 0.072 ± 0.013 mL O
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