Cardiac Ablation: How It Works & What to Expect

Cardiac ablation is a catheter procedure that treats abnormal heart rhythms by destroying the small area of tissue that triggers or sustains them. Here's how it works and what it treats.

What is cardiac ablation?

Cardiac ablation is a minimally invasive procedure that uses catheters to destroy (ablate) the small area of heart tissue responsible for an arrhythmia. Working in an electrophysiology (EP) lab, the operator threads catheters through a vein to the heart, maps the abnormal electrical activity, and delivers energy to eliminate it.

How the tissue is ablated

• Radiofrequency ablation — heat energy creates a small scar that blocks the abnormal signal.
• Cryoablation — extreme cold freezes and disables the tissue.
• Pulsed field ablation — a newer, tissue-selective technique.

What ablation treats

Arrhythmia	Ablation target
Atrial fibrillation	Pulmonary vein isolation
Atrial flutter	Cavotricuspid isthmus (high success)
SVT (AVNRT/AVRT)	The reentry circuit or accessory pathway
Ventricular tachycardia	The scar-related focus

The procedure & recovery

Ablation is done under sedation or anaesthesia. Catheters enter through the femoral vein, and 3-D mapping guides energy delivery. Most people go home the same day or after one night, with a short recovery. Success rates are high for typical atrial flutter and many SVTs, and good for atrial fibrillation, though AFib sometimes needs a repeat procedure.

Key takeaways

• Ablation destroys the tissue causing an arrhythmia via catheters in the EP lab.
• Energy sources: radiofrequency (heat), cryoablation (cold), pulsed field.
• It treats AFib (pulmonary vein isolation), flutter, SVT, and VT.
• Typical flutter and SVT ablations have especially high success rates.

Frequently asked questions

What is cardiac ablation?

A minimally invasive catheter procedure that destroys the small area of heart tissue responsible for an abnormal rhythm, performed in an electrophysiology lab.

How does cardiac ablation work?

Catheters map the abnormal electrical activity and deliver energy — radiofrequency heat, cryoablation cold, or pulsed field — to create a small scar that blocks the arrhythmia.

What conditions does ablation treat?

Atrial fibrillation (pulmonary vein isolation), atrial flutter, supraventricular tachycardias, and ventricular tachycardia.

Is cardiac ablation safe and effective?

It is generally safe and highly effective for typical atrial flutter and many SVTs; atrial fibrillation ablation works well but may require a repeat procedure.

What is recovery like after ablation?

Most people go home the same day or after one night and recover quickly, with the femoral access site healing over a few days.