Direct coronary artery perfusion from the left ventricle

Area of Science:

• Cardiovascular Surgery
• Interventional Cardiology
• Biomedical Engineering

Background:

• Coronary bypass surgery trends favor less invasive techniques and increased conduit use.
• Evaluating novel methods for myocardial revascularization is crucial for treating coronary artery disease.

Purpose of the Study:

• To investigate the feasibility of direct left ventricle to coronary artery perfusion for supporting cardiac function.
• To assess the impact of flow regulation on regional and global cardiac performance using this technique.

Main Methods:

• A conduit was created between the left ventricle and the left anterior descending coronary artery in dogs (n=6).
• A Starling resistor was used to regulate backward flow, with measurements of coronary flow, regional function, and reactive hyperemia.
• Global function was assessed in dogs with single or simultaneous double (left ventricle-left anterior descending and left ventricle-left circumflex) conduits.

Main Results:

• Unregulated left ventricle-coronary artery conduits provided approximately 45% of normal coronary flow and regional function.
• Regulation of backward flow via the Starling resistor increased mean coronary flow to 70.8% and regional function to 70.2% of normal values.
• Double conduits resulted in global ventricular contractility averaging 46% of normal values.

Conclusions:

• Direct left ventricle-coronary artery conduits can supply significant coronary blood flow and support regional cardiac function.
• Backward flow regulation enhances the efficacy of this perfusion strategy.
• This technique presents a potential rapidly deployable revascularization method for occluded coronary vessels lacking suitable natural conduits.