Question about cardiac catheter ablation, chance of dying during it?

Very unlikely: Death is a remote possibility during an ablation, but it is a possibility. A very low risk of death is present for many procedures however, and it should not deter patients who really need the procedure.

It Varies: In general it is very low risk. There are different types of ablations with varying degrees of risk. Atrial fibrillation ablation tends to carry some of the highest risk of any catheter ablation. Af ablations have a risk of death of 0.15%. Other ablations, like for svt, would be lower risk.