Abstract
Following myocardial infarction (MI), detrimental changes to the geometry, composition, and mechanical properties of the left ventricle (LV) are initiated in a process generally termed adverse post-MI remodeling. Cumulatively, these changes lead to a loss of LV function and are deterministic factors in the progression to heart failure. Proposed therapeutic strategies to target aberrant LV mechanics post-MI have shown potential to stabilize LV functional indices throughout the remodeling process. The in vivo quantification of LV mechanics, particularly within the MI region, is therefore essential to the continued development and evaluation of strategies to interrupt the post-MI remodeling process. The present study utilizes a porcine MI model and in vivo sonomicrometry to characterize MI region stiffness at 14 days post-MI. Obtained results demonstrate a significant dependence of mechanical properties on location and direction within the MI region, as well as cardiac phase. While approaches for comprehensive characterization of LV mechanics post-MI still need to be improved and standardized, our findings provide insight into the issues and complexities that must be considered within the MI region itself.
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Figure 1 was generated by Dr. Adam Hartstone-Rose in the Department of Cell Biology and Anatomy at the University of South Carolina School of Medicine. This work was supported by the National Institute of Health grants HL11090, HL089944, HL43617, HL67922, and Merit Award from the Veterans’ Affairs Health Administration. The authors wish to express their sincere appreciation to Ashley Sapp for her editorial assistance.
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Romito, E., Doviak, H., Logdon, C. et al. Sonomicrometry-Based Analysis of Post-Myocardial Infarction Regional Mechanics. Ann Biomed Eng 44, 3539–3552 (2016). https://doi.org/10.1007/s10439-016-1694-3
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DOI: https://doi.org/10.1007/s10439-016-1694-3