Optimized local infarct restraint improves left ventricular function and limits remodeling.

Area of Science:

• Cardiovascular Research
• Biomedical Engineering
• Regenerative Medicine

Background:

• Myocardial infarction (MI) can lead to adverse left ventricular (LV) remodeling, impairing cardiac function.
• Preventing infarct expansion and dyskinetic movement is crucial for limiting LV remodeling post-MI.

Purpose of the Study:

• To investigate the effects of a novel device that alters infarct stiffness and geometry on LV function and remodeling.
• To determine the optimal device inflation for maximizing stroke volume (SV) and preserving cardiac function.

Main Methods:

• A device was implanted in pigs with posterolateral infarctions.
• Magnetic resonance imaging (MRI) assessed LV size and function one week post-MI.
• The device was progressively inflated with saline, with optimal inflation determined by SV maximization.

Main Results:

• Device inflation to 6 mL or greater significantly reduced end-systolic volume and increased ejection fraction (EF) one week post-MI.
• Optimized device inflation (6-8 mL) improved systolic volume compared to controls.
• At 4 weeks, the treatment group showed preserved LV volumes and improved EF compared to the control group, which continued to dilate.

Conclusions:

• Optimized, isolated infarct restraint effectively limits adverse LV remodeling following MI.
• The tested device offers a potential patient-specific therapeutic approach to preserve cardiac function post-MI.