Impact of cardiac patch alignment on restoring post-infarct ventricular function.

Area of Science:

• Biomedical Engineering
• Computational Biology
• Cardiovascular Research

Background:

• Acute myocardial infarction (MI) impairs cardiac function, leading to heart failure via adverse ventricular remodeling (AVR).
• Tissue-engineered contractile patches offer a potential therapeutic strategy to restore cardiac function post-MI.

Purpose of the Study:

• To investigate the impact of cardiac patch orientation and material properties on left ventricular (LV) pump function recovery after MI using a computational model.
• To determine the optimal alignment of engineered cardiac patches relative to LV fibers for maximizing functional restoration.

Main Methods:

• A finite element model of LV mechanics was developed to simulate MI by altering regional active stress and passive stiffness.
• A rectangular cardiac patch was modeled, and its orientation relative to the LV circumferential plane was systematically varied.
• The influence of material properties of healthy and infarcted tissue on model outcomes was also examined.

Main Results:

• MI reduced stroke work by 34%.
• Optimal patch orientation, parallel to the subepicardial fiber direction, restored 9% of lost cardiac functionality.
• The engineered patch contributed to functional recovery through its own mechanical output and by improving the function of adjacent native myocardium.

Conclusions:

• Cardiac patch orientation is a critical factor in restoring pump function after myocardial infarction.
• Optimal alignment of engineered cardiac tissue with native myocardial fibers maximizes therapeutic benefit.
• Engineered cardiac patches can enhance native tissue function through favorable mechanical boundary condition changes, contributing to overall cardiac repair.