Topical cardiac cooling--computer simulation of myocardial temperature changes

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Computational Physiology

Background:

• Topical cardiac cooling (TC) is a common method for myocardial protection during cardiac surgery.
• Understanding the precise thermal distribution and effectiveness of TC is vital for patient outcomes.
• Previous studies have not fully explored the localized thermal effects of TC using detailed computational models.

Purpose of the Study:

• To investigate the temperature changes within a 3D heart model during topical cardiac cooling using computer simulation.
• To identify areas of the heart, particularly the right ventricular wall, that are less protected by TC.
• To evaluate the necessity of combining TC with other myocardial protection techniques.

Main Methods:

• Development of a 3D finite difference computer heart model based on Visible Human Data.
• Simulation of temperature diffusion using the explicit finite difference method and the temperature diffusion equation.
• Analysis of temperature distribution across different heart regions under various TC scenarios.

Main Results:

• Computer simulations revealed significant temperature variations within the heart model during TC.
• Regions of the heart not directly immersed in the TC solution showed reduced protection against ischemic injury.
• The right ventricular wall's temperature was significantly influenced by its proximity to the cooling solution.

Conclusions:

• Topical cardiac cooling alone may not provide uniform myocardial protection.
• Areas outside the direct application of TC are more susceptible to ischemia.
• Integrated myocardial protection strategies are essential, rather than relying solely on topical cooling.