Which factor contributes positively to lesion depth during RF ablation?

The factor that positively contributes to lesion depth during RF (radiofrequency) ablation is the delivery of more power. When higher power is transmitted during the ablation process, it increases the amount of energy that is deposited into the tissue. This enhanced energy delivery results in a greater elevation of tissue temperatures, leading to more extensive cellular destruction and deeper coagulative necrosis.

In RF ablation, generating higher temperatures is crucial for achieving effective lesions in the targeted tissue. Deeper lesions are desired for various clinical applications, such as treating arrhythmias or other conditions where the ablation of tissue needs to penetrate sufficiently to affect the underlying structures.

The other factors mentioned do not favorably impact lesion depth. For instance, lower tissue temperatures would lead to insufficient energy to create substantial lesions. Similarly, a reduced catheter size might limit the area of tissue that can be treated or the capability to deliver power effectively. Bidirectional current flow may influence the distribution of energy but does not inherently increase lesion depth compared to higher power output. Thus, the correct answer clearly aligns with the established principles in RF ablation techniques.