What are some possible complications of a cardiac ablation?

A few : Perforation, need for permanant pacer, infection, death, etc.

Partial List: It depends on the procedure. There are many ablations and the risks are determined by what structures we're near in the procedure. Pain at catheter insertion site bleeding cardiac perforation risk of pacemaker stroke damage to coronary arteries damage to heart valves good news: the risk of major complications is usually < 4%, *often* <1% w/ an excellent md and the risk of dying is usu < 1:1000.