Ventriculocoronary artery bypass (VCAB), a novel approach to myocardial revascularization

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Regenerative Medicine

Background:

• Saphenous vein grafts for myocardial revascularization exhibit poor long-term patency (50% at 10 years) and high rates of atherosclerosis.
• Existing bypass methods face limitations in durability and efficacy for treating ischemic heart conditions.

Purpose of the Study:

• To report on an implantation technique for a novel ventriculocoronary artery bypass (VCAB) device.
• To evaluate the in vivo performance and patency of a permanent transmyocardial channel connecting the left ventricle to a coronary artery.

Main Methods:

• An L-shaped titanium tube with a polyester cuff was implanted between the left ventricle and the left anterior descending coronary artery in juvenile pigs.
• The procedure was performed using a beating heart approach, with flow rates measured post-implantation.
• Patency and histological analysis were assessed at 2 weeks post-explantation.

Main Results:

• The VCAB device demonstrated a flow rate of 76% of baseline, with forward flow occurring during systole.
• A high patency rate of 91% was observed at the 2-week follow-up.
• Histological examination revealed the formation of organizing tissue at the coronary interface, indicating tissue integration.

Conclusions:

• The preliminary findings suggest that the VCAB device is a promising approach for perfusing ischemic myocardium via systolic flow.
• The excellent 2-week patency of the transmyocardial titanium conduit supports further investigation in longer-duration studies.
• This novel technique offers a potential advancement in surgical treatment for coronary artery disease.