Rate process model for arterial tissue thermal damage: implications on vessel photocoagulation

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Biophysics

Background:

• Thermal damage to human arterial tissue is a critical concern in various medical procedures.
• Understanding the kinetics of protein denaturation is essential for modeling tissue response to heat.
• Existing models may not fully capture the complexities of thermal coagulation in arterial walls.

Purpose of the Study:

• To develop and validate a numerical model for predicting thermal damage in human arterial tissue.
• To identify the key molecular components responsible for thermal coagulation.
• To assess the model's predictive capability in laser-induced coagulation scenarios.

Main Methods:

• A numerical model based on protein denaturation kinetics was developed.
• A feedback-controlled constant surface temperature device was used to create 80 coagulative lesions.
• Coefficients A and delta E were determined experimentally for arterial tissue.
• Histological analysis and argon laser irradiation were employed for validation.

Main Results:

• The determined coefficients (A = 5.6 x 10^63 s^-1, delta E = 430 KJ/mol) closely match those for collagen denaturation.
• Histological observations confirmed collagen as the primary coagulating component.
• The model demonstrated ability to predict tissue coagulation onset during laser irradiation.

Conclusions:

• Collagen is the primary component responsible for thermal coagulative damage in human arterial tissue.
• The developed numerical model provides a reliable tool for predicting thermal damage and optimizing laser treatments.
• This research contributes to a better understanding of thermal injury mechanisms in vascular tissues.