Which statement about cryo ablation lesion factors is true?

• A. Repetitive freeze-thaw cycles in the same area improve lesion
• B. A single pass always yields the largest lesion
• C. Rapid thaw improves lesion size
• D. Thaw rate has no effect on lesion

Answer: (A)

In cryoablation, the extent of tissue injury grows with repeated freeze–thaw cycles in the same area. Each cycle adds more ice formation, disrupts cell membranes, and damages the microvasculature, so a second or subsequent pass accumulates damage beyond what a single freeze achieves. That’s why repeating the freeze–thaw process enlarges the lesion more than just one pass.

Context on thaw: the rate at which tissue thaws also matters—slower thaw typically allows more time for ice crystal growth and vascular injury, increasing lesion size, whereas rapid thaw can reduce the extent of damage. So the idea that a single pass or rapid thaw would maximize lesion isn’t correct, and thaw rate does influence lesion size.

So repetitive freeze–thaw cycles in the same area best explain why the lesion enlarges, making that option the correct choice.