Myocardial distribution of asanguineous solutions retroperfused under low pressure through the coronary sinus

Area of Science:

• Cardiovascular Science
• Medical Technology
• Cardiac Surgery

Background:

• Antegrade coronary artery perfusion is standard for delivering cardioplegia and cooling.
• Limitations exist when antegrade perfusion is unavailable or disadvantageous.

Purpose of the Study:

• To evaluate asanguineous retroperfusion of the coronary sinus for myocardial protection.
• To determine the microvascular penetration and drainage patterns of this technique.

Main Methods:

• Utilized retrograde coronary sinus perfusion with asanguineous agents.
• Employed india ink preparations, regional flow studies, and retrograde roentgenograms.
• Analyzed myocardial regions and drainage routes.

Main Results:

• Retroperfusion successfully permeated microvasculature in the left ventricle apex, septum, endocardium, and free wall.
• Thebesian-sinusoid system drainage predominated over the capillary-arterial route (3:1 ratio).
• This method allows microvascular delivery of cardioplegia and core cooling.

Conclusions:

• Asanguineous retroperfusion is a viable alternative for myocardial protection when antegrade perfusion fails.
• The technique effectively reaches critical myocardial regions via the microvascular bed.
• Potential limitations for chronic revascularization exist due to the primarily venous (Thebesian) flow, requiring further metabolic investigation.