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Updated: Jun 25, 2026
09:45
Histological Quantification of Chronic Myocardial Infarct in Rats
Published on: December 11, 2016
Theoretic impact of infarct compliance on left ventricular function
James J Pilla1, Joseph H Gorman, Robert C Gorman
1Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19036, USA.
The Annals of Thoracic Surgery
|February 24, 2009
Summary
Stiffer infarcts after myocardial infarction lead to less left ventricular (LV) dilation and improved LV function. This study modeled how infarct compliance impacts cardiovascular dynamics post-heart attack.
Area of Science:
- Cardiovascular Physiology
- Computational Biology
- Biomedical Engineering
Background:
- Coronary occlusion causes immediate loss of contractile function in the infarct region.
- The healing process of myocardial infarction involves complex, time-dependent changes in infarct material properties.
- Experimental data on infarct material properties and their effects on cardiac function are limited.
Purpose of the Study:
- To theoretically assess the effects of infarct compliance on left ventricular (LV) size and function after myocardial infarction.
- To understand the relationship between infarct stiffness and cardiovascular dynamics.
Main Methods:
- A closed-loop lumped-parameter model of the ovine cardiovascular system was utilized.
- The model simulated time-varying LV function, partitioning it into infarct and noninfarct regions.
- An adaptive compensatory mechanism maintained stroke volume by adjusting total blood volume.
Main Results:
- Model simulations accurately reproduced normal pre-infarction cardiovascular values and experimentally observed post-infarction changes.
- Decreasing infarct compliance (increasing stiffness) in a 20% infarct led to reduced LV end-diastolic volume and pressure.
- Increased ejection fraction and improved estimated LV oxygen consumption were observed with stiffer infarcts.
Conclusions:
- Stiffer infarcts are associated with reduced left ventricular (LV) dilatation.
- Decreased filling pressures and improved global LV function are linked to stiffer infarcts.
- Infarct compliance is a critical factor influencing LV remodeling and function post-myocardial infarction.
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