Which factor is essential for proper lesion formation in RF ablation?

Proper lesion formation in radiofrequency (RF) ablation heavily relies on having good catheter contact and reduced impedance. When the catheter makes effective contact with the tissue, it ensures that RF energy is delivered efficiently and uniformly. Good contact minimizes the distance over which the energy must travel, allowing for better heat transfer to the surrounding tissues. This leads to the desired thermal injury that characterizes effective lesion formation.

Additionally, reduced impedance is crucial as it indicates that the energy is passing effectively through the tissue and into the target area. Higher impedance can result in less efficient energy delivery, potentially leading to inadequate lesion formation. In essence, optimal contact between the catheter and tissue, along with low impedance, facilitates a higher degree of thermal energy transfer, which is essential for achieving the successful ablation of target tissue.