Key result
Simulation reveals cardiac fibers endure high structural overload for two weeks post-apical MI before diminishing.
Why the study?
Few studies have evaluated the elastic behaviour of cardiac tissue after myocardial infarction to understand elastic alterations during post-infarction ventricular remodelling.
Finite element simulation demonstrates that cardiac fibers experience significant structural overload in the first two weeks post-apical infarction, which decreases over time as pumping capacity declines.
May inform early post-MI fiber protection strategies; extends finite element models of time-dependent myocardial overload.
Several research works in the literature have focused on understanding the post-infarction ventricular remodelling phenomenon, but few works have considered the evaluation of the elastic behaviour of the cardiac tissue after a myocardial infarction. This paper presents an investigation focused on predicting the elastic performance of the human heart after a left ventricular apical infarction. The aim is to understand the elastic alterations of the cardiac fibres at different periods after an apical infarct. For this purpose, a hybrid method based on pressure and volume measurements of the left ventricle (LV) at different periods of ventricular remodelling, and the Finite Element Method (FEM), is developed. In addition, several performance indexes are defined to evaluate the heart performance during the ventricular remodelling process. The results show that during the first 2 weeks after a heart infarction, the cardiac fibres must support a much higher structural overload than during normal conditions. This structural overload is proportional to the aneurysm size but diminishes with the time, together with a significant reduction of the ventricular pumping capacity.
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Córdova-Aquino et al. (2023) studied Left ventricular apical infarction. Finite Element Method (FEM) simulation vs. Normal conditions was evaluated on Elastic performance and structural overload of cardiac fibres. Finite element simulation showed that during the first 2 weeks after an apical infarction, cardiac fibres support a much higher structural overload than normal, which diminishes over time.
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