Modification of infarct material properties limits adverse ventricular remodeling

Area of Science:

• Cardiovascular Research
• Biomaterials Science
• Regenerative Medicine

Background:

• Infarct expansion post-myocardial infarction (MI) drives adverse left ventricular (LV) remodeling.
• Current treatments lack methods to directly modify infarct tissue characteristics.

Purpose of the Study:

• To test if biomaterial injection for infarct stiffening and thickening can limit infarct expansion and LV remodeling.
• To evaluate the efficacy of infarct modification in a preclinical model.

Main Methods:

• Anteroapical infarction induced in 21 sheep, randomized to saline or biomaterial injection within 3 hours.
• Echocardiography and morphometric analysis over 8 weeks to assess infarct expansion, LV remodeling, and infarct thickness.
• Biaxial tensile testing and blood flow measurements to characterize infarct properties.

Main Results:

• Biomaterial treatment significantly reduced infarct expansion and LV dilatation compared to controls.
• Treated infarcts were thicker and had greater blood flow.
• Increased infarct stiffness was confirmed by reduced longitudinal peak strain in the treatment group.

Conclusions:

• Biomaterial injection effectively thickens and stiffens infarcts, ameliorating post-MI adverse remodeling.
• This novel treatment paradigm shows potential for clinical translation after further material optimization.