Maze Procedure—Open Surgery
by Pamela Jones, MA
Maze is a surgical procedure for the heart. Incisions are made through the electrical system of the upper chambers of the heart. The chambers are called the atria.
Reasons for Procedure TOP
Maze is done to treat atrial fibrillation. Fibrillation is abnormal beating of the heart muscle. It is caused by erratic electrical impulses that travel through the heart muscle. These impulses can cause the chambers to beat too fast. This can decrease blood flow through the heart. Atrial fibrillation can also cause blood clots to form in the heart that can travel to the brain and cause a stroke.
Maze is used to treat severe cases that did not respond to medications or other procedures. Electrical impulses cannot flow through scar tissue. By creating specific patterns of scar tissue, the surgery creates a pathway for healthy impulses and blocks erratic impulses. The scars may look like a maze.
Possible Complications TOP
Problems from the procedure are rare, but all procedures have some risk. Your doctor will review potential problems, like:
Before your procedure, talk to your doctor about ways to manage factors that may increase your risk of complications such as:
What to Expect TOP
Prior to Procedure
Your doctor may do the following:
In the days leading up to the procedure:
General anesthesia will be used. You will be asleep during the surgery. You may also be given a sedative before surgery to help you relax.
Description of the Procedure TOP
After you are asleep, the doctor will cut through the skin and breastbone. The chest cavity will be opened. Next, the heart will be connected to the heart-lung machine. This machine will take over the functions of the heart and lungs during surgery. Once the machine is active, the heart will be stopped.
A series of small cuts will be made in the atria. The cuts will be made in a pattern to direct the electrical impulses that may look like a maze. The incisions will then be closed with sutures. In some cases, a pacemaker may need to be placed.
Once the maze-like pattern has been completed, the heart will be restarted. When the heart is working well, you will be removed from the heart-lung machine. The chest will be closed with wires. Finally, the skin will be closed with sutures.
Immediately After Procedure TOP
Your recovery will be monitored in the intensive care unit. Your heart’s activity will be recorded by ECG. Pain medication will be given to help you rest comfortably.
How Long Will It Take? TOP
About 3 hours
How Much Will It Hurt? TOP
Anesthesia will prevent pain during surgery. Pain and discomfort after the procedure can be managed with medications.
Average Hospital Stay TOP
Post-procedure Care TOP
At the Hospital
While you are recovering at the hospital, you may receive the following care:
During your stay, the hospital staff will take steps to reduce your chance of infection such as:
There are also steps you can take to reduce your chances of infection such as:
It can take up to 6 months to fully recover. Be sure to follow your doctor’s instructions, which may include:
Call Your Doctor TOP
It is important to monitor your recovery. Alert your doctor to any problems. If any of the following occur, call your doctor:
Call for emergency medical services or go to the emergency room right away if any of the following occurs:
If you think you have an emergency, call for emergency medical services right away.
American Heart Association
Heart Rhythm Society
Canadian Heart Rhythm Society
Heart and Stroke Foundation of Canada
Cardiac rhythm disturbances. Society of Thoracic Surgeons website. Available at: https://ctsurgerypatients.org/adult-heart-disease/cardiac-rhythm-disturbances. Updated July 2016. Accessed November 28, 2017.
Maze procedure for treatment of atrial fibrillation. University of Southern California Cardiothoracic Surgery website. Available at:
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Accessed November 28, 2017.
Maze surgery. Texas Heart institute website. Available at:
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Updated August 2016. Accessed November 28, 2017.
Last reviewed November 2018 by EBSCO Medical Review Board Michael J. Fucci, DO, FACC
Last Updated: 12/20/2014
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