Valve Surgery with Atrial Fibrillation.
Atrial fibrillation (AF) is the most common cardiac arrhythmia, and it frequently coexists with valvular heart disease — particularly mitral valve disease, where 30-50% of patients have AF by the time they reach surgery. When a patient needs valve surgery and also has AF, a critical question arises: should the AF be treated surgically at the same time? This concomitant procedure — typically the Cox-Maze IV procedure or a lesion set using radiofrequency or cryoablation — adds modest time and complexity to the operation but can restore normal sinus rhythm and eliminate the need for long-term anticoagulation. The stakes of this decision are significant. Left untreated, AF carries ongoing risks of stroke, heart failure, and reduced quality of life. However, surgical AF ablation adds 15-30 minutes of additional operative time, and its success rates vary based on AF type (paroxysmal vs. persistent vs. long-standing persistent), left atrial size, and the ablation technique used. Many patients are not told that AF can be addressed during their valve surgery, and some surgeons do not perform the Maze procedure. This knowledge gap can lead to a missed opportunity that is difficult to recapture after the initial operation.
What the evidence shows.
The landmark study supporting concomitant AF ablation is the Cardiothoracic Surgical Trials Network (CTSN) randomized trial (2015), which showed that surgical ablation during mitral valve surgery restored sinus rhythm in 63.2% of patients at 12 months, compared to 29.4% with no ablation — a highly significant difference. Freedom from AF was durable at 4-year follow-up. The study also showed that a biatrial lesion set was superior to pulmonary vein isolation alone (66% vs 55% sinus rhythm at 1 year). The STS National Database shows that concomitant AF ablation does not significantly increase operative mortality when performed by experienced surgeons, with an incremental cross-clamp time of approximately 15-20 minutes.
Current recommendations.
The 2017 STS Clinical Practice Guidelines and the 2023 ACC/AHA/HRS atrial fibrillation guidelines both recommend surgical ablation of AF as a concomitant procedure during mitral valve surgery (Class I recommendation). For patients undergoing aortic valve surgery or CABG with AF, the recommendation is Class IIa (reasonable to perform). The guidelines specify that a biatrial lesion set is preferred over left-atrial-only ablation, and that left atrial appendage exclusion should be performed at the time of surgical AF ablation to reduce stroke risk. These procedures should be performed at centers with experience in surgical AF ablation.
Why this matters for your decision.
If AF is not addressed during valve surgery, the patient faces a lifetime of anticoagulation, ongoing stroke risk, and the possibility of needing a separate catheter ablation procedure later — which has lower success rates for long-standing persistent AF than the surgical Maze procedure. A second opinion is essential to ensure patients know that concomitant AF ablation is an option, that their surgeon has experience performing it, and that the planned lesion set is comprehensive enough to maximize the chance of restoring sinus rhythm.
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