Which of the following negatively affects convective cooling?

High blood flow negatively affects convective cooling because increased blood flow enhances the heat removal capability of the blood from the target tissue. In the context of ablation, effective cooling is essential to protect surrounding tissues and maintain appropriate temperatures for efficient treatment. When there is high blood flow, more heat is carried away from the ablation site, which can lead to insufficient localized heating of the tissue. This makes it more difficult to achieve the desired effects of the ablation process, as the removal of heat by the circulating blood can counteract the intended thermal effects on the tissue that is being treated.

In contrast, factors such as stable catheter position and high tissue contact can actually enhance the performance of the ablation by promoting consistent energy delivery and maximizing the treatment area, while excessive irrigation could introduce more cooling than needed but does not directly relate to blood flow dynamics.