Atrial fibrillation surgery simplified with cryoablation to improve left atrial function

Area of Science:

• Cardiovascular Surgery
• Cardiac Electrophysiology
• Minimally Invasive Cardiac Procedures

Background:

• The Maze procedure is a surgical treatment for atrial fibrillation aiming to restore normal sinus rhythm.
• Conventional Maze procedures may not always achieve complete left atrial functional recovery.
• A modified Maze technique incorporating linear cryoablation has been developed to address this limitation.

Purpose of the Study:

• To evaluate the efficacy of a modified Maze procedure with linear cryoablation.
• To compare the outcomes of the modified Maze technique against the conventional Maze III technique.
• To assess the impact on sinus rhythm conversion and left atrial function.

Main Methods:

• Eighty-three patients undergoing atrial fibrillation surgery concurrent with mitral valve surgery were divided into two groups.
• Group I (n=30) received the conventional Maze III technique.
• Group II (n=53) received the modified technique with linear cryoablation. Outcomes were assessed postoperatively and at 6 months.

Main Results:

• Sinus rhythm conversion occurred significantly earlier in the modified group (2.4 days) versus the conventional group (7.0 days).
• The modified technique demonstrated superior left atrial contractile function, indicated by higher mean transmitral A-wave velocity.
• A higher incidence of A-wave appearance was observed in the modified group at both early and 6-month postoperative assessments.

Conclusions:

• The modified Maze procedure with linear cryoablation facilitates earlier restoration of sinus rhythm.
• This technique results in superior left atrial contractile function compared to the standard Maze III procedure.
• The modification enhances early and sustained recovery of atrial function post-surgery.