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Ann Thorac Surg 2005;80:2257-2262
© 2005 The Society of Thoracic Surgeons
a Harrison Department of Surgical Research, Philadelphia, Pennsylvania
b Department of Radiology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
Accepted for publication May 11, 2005.
* Address correspondence to Dr Robert C. Gorman, Harrison Department of Surgical Research, University of Pennsylvania School of Medicine, 313 Stemmler Hall, 36th and Hamilton Walk, Philadelphia, PA19104-4283 (Email: gormanr{at}uphs.upenn.edu).
Presented at the Poster Session of the Forty-first Annual Meeting of The Society of Thoracic Surgeons, Tampa, FL, Jan 24–26, 2005.
BACKGROUND: Early infarct expansion impairs function of normally perfused borderzone myocardium (BZM), initiates adverse remodeling, and portends a poor long-term outcome. Early ventricular restraint has been demonstrated to improve global remodeling but its effect on BZM function has not been assessed. Using an ovine model of infarct induced remodeling and MRI, we tested the hypothesis that ventricular restraint early after MI preserves BZM function and reduces remodeling.
METHODS: Six sheep had a large anterior infarction after ligation of all diagonal branches. One week after infarction 3 sheep had placement of a cardiac support device (CSD) to restrain infarct expansion. Global remodeling and borderzone wall thickening strain were assessed using tagged MRI before and 8 weeks after infarction.
RESULTS: Global remodeling was greatly reduced in the CSD group compared with control. The BZM systolic wall thickening was similar in both groups at baseline (13.5% ± 2.0%, control; 12.8% ± 2.0%, CSD, p = 0.8). After 8 weeks of infarction-induced remodeling, systolic wall thickening strain decreased significantly to 4.9% ± 0.7% in the control group (p = 0.03). In contrast, systolic wall thickening was preserved in the CSD group at 8 weeks (11.0% ± 1.6%, p = 0.3). In the control group all thickening occurred during isovolemic contraction, plateauing during ejection. The CSD improved late systolic borderzone wall thickening, although dynamics remained perturbed.
CONCLUSIONS: Ventricular restraint early after MI improves both contractile function of the BZM and global ventricular remodeling. The dynamics of BZM wall thickening are impaired during remodeling. The CSD significantly improves but does not completely maintain baseline BZM wall thickening dynamics.
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