The idea behind it
A catheter ablation finds the specific piece of heart tissue responsible for an abnormal electrical signal and uses targeted energy — heat, or less commonly extreme cold — to stop that tissue from conducting the faulty signal. Medication manages a rhythm problem. Ablation goes after the source of it, and for many arrhythmias, it can be curative.
The procedure
It's typically done under sedation or general anesthesia. Thin catheters go in through a vein, usually in the groin, up into the heart. Once there, we map the electrical system — often in real time, using three-dimensional imaging — to pinpoint exactly where the abnormal signal starts. Energy goes to that specific spot. Depending on how complex the arrhythmia is, the whole thing can take anywhere from under an hour to several hours.
Recovery
Most patients stay overnight for monitoring and go home the next day. There are usually short-term limits on heavy lifting and strenuous activity while the access site heals, generally about a week. Some patients stay on medication for a while afterward as the treated area settles, even when the goal is eventually to come off it.
What it doesn't guarantee
Ablation has strong, well-documented success rates for many arrhythmias, but no procedure guarantees an arrhythmia never comes back, and some conditions need more than one ablation over time. Ask your own physician about the specific success rate and recurrence risk for your particular arrhythmia — it varies enough that a general number won't tell you much.