Atrial Fibrillation Surgery
What is a Maze procedure?
The Maze procedure is a type of heart surgery used to treat atrial fibrillation.
The heart has 4 chambers. There are 2 upper chambers called atria and 2 lower chambers
called ventricles. Normally, a specialized group of cells called the sinoatrial (SA)
node in the upper right chamber of your heart, or the right atrium, provide the signal
to start your heartbeat. With AFib, the signal to start the heartbeat doesn’t begin
in the SA node the way it should. Instead, the signal begins somewhere else in the
atria. This causes the atria to quiver or “fibrillate.” The atria can’t contract normally
to move blood to the ventricles. The disorganized signal spreads to the ventricles,
causing them to contract irregularly and sometimes more quickly than they normally
would. The contraction of the atria and the ventricles is no longer coordinated. The
ventricles may not be able to pump enough blood to the body.
In a traditional Maze procedure, the surgeon makes a number of small cuts in the atrium
and then sews them back together. The heart’s electrical signal is not able to cross
these cuts. The cut area now stops conducting the abnormal signals that caused the
atrial fibrillation. This allows the heart rhythm to return to normal. Traditionally,
the Maze procedure is done as part of an open-heart surgery assisted with a heart-lung
machine (cardiopulmonary bypass).
Instead of making cuts, healthcare providers can also use radiofrequency energy or
cryoablation (freezing of the tissue) to disrupt the abnormal signals. These methods
may allow the surgeon to use smaller incisions than would be needed for traditional
open-heart surgery. Sometimes the surgeon inserts a camera and small surgical instruments
to perform the surgery.
Why might I need a Maze procedure?
Some people have unpleasant symptoms from atrial fibrillation, like shortness of breath.
AFib also greatly increases the risk for stroke. Blood-thinners used for preventing
stroke pose their own risks, and some medicines require extra blood tests for monitoring.
Many people with AFib take medicines to help control their heart rate or their heart
rhythm. Although some people respond well to these medicines, others do not. A Maze
procedure is not guaranteed to stop your AFib for good. But it may be an option for
There are other surgical procedures as well as less invasive procedures, such as ablation,
that are also options to control AFib. Depending on your health history, you may be
a better fit for a particular procedure over another. Your healthcare provider can
review what options are best for you. They may recommend the Maze procedure if you
have AFib and already need open heart surgery to correct another problem, such as
coronary artery disease or a heart valve problem.
Some people may be able to stop taking blood-thinner medicine after the Maze procedure.
Ask your healthcare provider about the pros and cons of the procedure in your situation.
What are the risks of a Maze procedure?
Though uncommon, complications do sometimes happen. Rarely, some of these may be fatal.
You may have specific risks based on your health conditions. You are more likely to
have complications if you are older or if you have other health and heart conditions.
Discuss all your concerns with your healthcare provider before your surgery. Risks
Blood clots, which might lead to a stroke or heart attack
Other abnormal heart rhythms
Complications from anesthesia
How do I get ready for a Maze procedure?
Your healthcare provider will talk with your about how to prepare for your upcoming
surgery. Remember the following:
Follow any directions you are given for not eating or drinking before surgery.
Try to stop smoking before your operation. Ask your healthcare provider about ways
that can help you stop smoking.
You may need to stop taking certain medicines such as warfarin before your surgery.
Follow your healthcare provider's instructions about which medicines s should be stopped
You may need some routine tests before the procedure to assess your health before
surgery. These may include:
Electrocardiogram (ECG), to assess the heart rhythm
Echocardiogram (echo), to assess heart structure and function
If needed, someone may shave your skin above the area of operation. About an hour
before the operation, someone may give you medicines to help you relax.
What happens during a Maze procedure?
Talk with your healthcare provider about what to expect about your Maze procedure.
The following is a general description of the traditional Maze surgery, but your healthcare
provider may plan a less invasive procedure. Because the Maze procedure is commonly
done in people needing heart surgery for another reason, the surgical process may
be different. During a typical open-heart Maze procedure:
A healthcare provider will give you anesthesia before the surgery starts. This will
cause you to sleep deeply and painlessly during the operation. Afterward, you won’t
remember the operation.
The operation will take several hours. Your surgeon will make an incision down the
middle of your chest and separate your breastbone.
The surgery team will connect you to a heart-lung machine. This machine will act as
your heart and lungs during the procedure.
Your surgeon will make several cuts through the atria and then sew them back together.
Or your surgeon might use radiofrequency energy or another energy source to destroy
small areas of tissue.
Once complete, the surgery team will remove the heart-lung machine.
The team will connect your breastbone back together.
The team will then close the incision on your skin using stitches or staples.
What happens after a Maze procedure?
In the hospital
When you wake up, you might feel confused at first. You might wake up a couple of
hours after the surgery, or a little later.
The team will carefully monitor your vital signs, such as your heart rate. You will
be hooked up to several machines so that you are continuously monitored.
You may have a tube in your throat to help you breathe. This may be uncomfortable,
and you won’t be able to talk. It will usually be removed within 24 hours when you
are stronger and can breathe on your own.
You may have a chest tube to drain excess fluid from your chest.
You will likely feel some soreness, but you shouldn’t feel severe pain. If you need
it, you can ask for pain medicine.
Soon after surgery, you will likely be encouraged to get up and sit in a chair. In
a day or two, you should be able to walk with help.
You may do breathing therapy to help remove fluids that can collect in your lungs
during and after surgery.
You will probably be able to drink liquids once the breathing tube is removed, usually
the day after surgery. You can have regular foods as soon as you can tolerate them.
You will probably need to stay in the hospital for several days. It might be less
than that if you had less invasive surgery.
Make sure you have someone to drive you home from the hospital. For a while, you will
also need some help at home.
You may tire easily after the surgery, but you will gradually start to recover your
strength. It may be several weeks before you fully recover.
Ask your healthcare provider about when it is safe for you to drive.
Don't lift anything heavy for several weeks.
Keep all follow-up appointments. You will probably have your stitches or staples removed
at a follow-up appointment in 7 to 10 days.
Follow all the instructions your healthcare provider gives you for medicines, exercise,
diet, and wound care.
Before you agree to the test or the procedure make sure you know:
The name of the test or procedure
The reason you are having the test or procedure
What results to expect and what they mean
The risks and benefits of the test or procedure
What the possible side effects or complications are
When and where you are to have the test or procedure
Who will do the test or procedure and what that person’s qualifications are
What would happen if you did not have the test or procedure
Any alternative tests or procedures to think about
When and how you will get the results
Who to call after the test or procedure if you have questions or problems
How much you will have to pay for the test or procedure