During cryoablation, microcirculatory failure contributing to tissue injury occurs during which phase?

During cryoablation, microcirculatory failure contributing to tissue injury occurs during which phase?

• A. Thawing phase
• B. Freezing phase
• C. Heating phase
• D. Post-ablation

Answer: (A)

Microvascular injury is the main driver of tissue destruction in cryoablation, and the critical window for that injury is the thawing phase. As tissue thaws, ice crystals recrystallize and grow, which damages the endothelial lining of small vessels. This endothelial injury promotes capillary leakage, microthrombosis, and loss of perfusion to the previously frozen area. The resulting ischemia leads to additional cell death beyond the initial freezing injury. Heating and post-ablation phases don’t produce the same endothelial disruption and perfusion collapse, so the thawing phase best explains the microcirculatory contribution to tissue injury.

Microvascular injury is the main driver of tissue destruction in cryoablation, and the critical window for that injury is the thawing phase. As tissue thaws, ice crystals recrystallize and grow, which damages the endothelial lining of small vessels. This endothelial injury promotes capillary leakage, microthrombosis, and loss of perfusion to the previously frozen area. The resulting ischemia leads to additional cell death beyond the initial freezing injury. Heating and post-ablation phases don’t produce the same endothelial disruption and perfusion collapse, so the thawing phase best explains the microcirculatory contribution to tissue injury.