Which of the following is not a factor that influences RF lesion size?

Which of the following is not a factor that influences RF lesion size?

• A. Temperature
• B. Electrode size
• C. Time
• D. Power

Answer: (A)

RF lesion size is driven by how much energy you deposit into tissue, not by a separate temperature setting. The key levers are power, duration, and electrode size, which together determine how much energy is delivered and how it is distributed in tissue. Tissue temperature rises as a result of that energy delivery, and once it reaches cytotoxic levels, a lesion forms. But temperature itself isn’t an independent control parameter you set to shape the lesion; it’s the consequence of the chosen power, time, and electrode geometry. So while higher power or longer time and a larger electrode can produce a bigger lesion, temperature is the outcome, not a separate factor to adjust.

RF lesion size is driven by how much energy you deposit into tissue, not by a separate temperature setting. The key levers are power, duration, and electrode size, which together determine how much energy is delivered and how it is distributed in tissue. Tissue temperature rises as a result of that energy delivery, and once it reaches cytotoxic levels, a lesion forms. But temperature itself isn’t an independent control parameter you set to shape the lesion; it’s the consequence of the chosen power, time, and electrode geometry. So while higher power or longer time and a larger electrode can produce a bigger lesion, temperature is the outcome, not a separate factor to adjust.