Rhythm & Maze surgery · Decision guide

Atrial fibrillation surgery: Maze, ablation and appendage closure

Name: Atrial fibrillation surgery: Maze, ablation and appendage closure
Creator: Yevhenii Kozlov

Understand rhythm treatment during another heart operation and why stroke prevention is a separate question.

Research by Yevhenii Kozlov · Co-Founder of BookimedUpdated 8 October 2026Sources linked throughout

At a glance

Rhythm surgery and stroke-prevention procedures have different purposes. Maze or surgical ablation targets abnormal electrical pathways; left-atrial-appendage closure targets a source of blood clots.

Combined treatment can be relevant

AF may be treated during another planned cardiac operation rather than requiring a separate open-heart operation.

Sources: STS: AF during cardiac surgery

Appendage closure adds stroke protection

LAAOS III found benefit in patients with AF and elevated stroke risk already having cardiac surgery, on top of usual care including anticoagulation.

Sources: LAAOS III trial · ACC

A pacemaker has a different job

Rate support or protection against dangerous rhythms is distinct from ablation or appendage closure.

Sources: Conditions treated by heart surgery

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Benefits and trade-offs

Potential advantages

An already planned operation can provide an opportunity to address AF and stroke risk in the same treatment course.
Sources: STS: AF during cardiac surgery · LAAOS III trial · ACC

Trade-offs and limits

Appendage closure does not automatically replace blood thinners, and freedom from AF depends on the rhythm type, treatment and monitoring used.
Sources: LAAOS III trial · ACC

Name the goal of each procedure

Treatment	Main purpose
Medicines or catheter ablation	Control symptoms, heart rate or rhythm according to the arrhythmia
Surgical ablation / Maze	Interrupt abnormal electrical pathways, sometimes during another planned cardiac operation
Left-atrial-appendage closure	Reduce a source of clot-related stroke risk in selected patients
Pacemaker / ICD	Treat separate slow-rate or dangerous-rhythm needs

Sources: Conditions treated by heart surgery · STS: AF during cardiac surgery · LAAOS III trial · ACC

If you already need valve surgery or bypass

STS guidance addresses surgical ablation and appendage management in patients with AF undergoing first-time nonemergency cardiac surgery. Raise this before the operation so the team can explain the combined plan.

Sources: STS: AF during cardiac surgery

Heart valves Coronary bypass

Appendage closure does not automatically replace anticoagulation

LAAOS III studied patients with AF and elevated stroke risk already undergoing cardiac surgery. Appendage occlusion reduced stroke or systemic embolism on a background of usual care including anticoagulation. The study does not justify stopping blood thinners because the appendage was closed.

Sources: LAAOS III trial · ACC

Rhythm control and stroke protection measure different benefits

Freedom from AF, freedom from rhythm medicines and avoidance of stroke are distinct outcomes. Rhythm monitoring and follow-up duration determine what a reported result can show.

A normal rhythm at discharge does not establish durable freedom from AF.
Appendage closure in LAAOS III added to usual care, including anticoagulation.
Permanent pacing and other complications remain relevant to the overall result.

Sources: STS: AF during cardiac surgery · LAAOS III trial · ACC

The information that defines rhythm treatment

The rhythm diagnosis and monitoring show the pattern and duration of the arrhythmia.
Earlier ablations and current medicines show what treatment has already been tried.
An associated cardiac operation changes whether surgical ablation can be combined with other care.

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Specialists for this treatment pathway

Explore each specialist’s clinical focus, current programme and the studies relevant to this treatment. The listed roles include cardiac surgeons and, where appropriate, interventional cardiologists.