What is a cardiac ablation? Is it safe?

Yes, reasonably safe. Cardiac ablation is a procedure that cardiac electrophysiologist use to burn out some extra pathway where the heart's electrical current might initiate erratically. The physician needs to do cardiac mapping and find out where is the possible source of extra firing source of the electrical current. Md then burn them out with freezing burn. Under good hands it is relatively safe, 1% complication.
Ablation. it is usually relatively safe provided that an expert with experience doing it/
Generally, yes. The major complication rate for simple ablations is <1% in expert hands. Even for complex ablations, the major complication rate is usually <4%.