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Patent Foramen Ovale

Bkg patient pfo hero

During development, prior to birth, a channel between the right and left sides of the heart called the foramen ovale, allows blood to bypass the lungs. In about 33% of people, the foramen ovale does not close completely, creating a “patent foramen ovale”.

This page is for patients who have previously suffered a stroke that was from an unknown cause (also called “cryptogenic stroke”) and also have an opening in their heart between the two upper chambers of the heart that never fully closed after birth. The medical term for this opening in the heart is patent foramen ovale (PFO). The information will help you learn more about cryptogenic stroke, PFO, and treatments to reduce the chance of having another stroke. You should consult with a doctor regarding the diagnosis or treatment of your medical condition.

Alan’s story

At age 37, Alan went from being a healthy, active individual to having a stroke. Learn how the Amplatzer™ PFO Occluder eased his fears of suddenly having another stroke to living an energetic, hopeful life.

Your heart and the foramen ovale

During development, prior to birth, a channel between the right and left sides of the heart called the foramen ovale, allows blood from veins to bypass the lungs. In about 33% of people, the foramen ovale does not close completely after birth. When the foramen ovale remains open, it is called a “patent foramen ovale” or a PFO. Typically, a PFO causes no problems. However, in some cases, it can allow a small amount of blood to pass from the right side of the heart to the left side of the heart.

The diagram below shows an open foramen ovale before birth, a closed foramen ovale after birth, and a patent foramen ovale after birth.

PFO Diagram
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Stroke overview

Strokes are caused by a sudden interruption in blood flow to a part of the brain or bleeding within the brain tissue. When this happens, brain cells are deprived of oxygen and begin to die, causing brain damage. When brain cells die during a stroke, the function controlled by that part of the brain, like speech or movement, may be impaired.

There are two major types of stroke: hemorrhagic stroke and ischemic stroke. A hemorrhagic stroke occurs when damaged blood vessels in the brain allow bleeding into the brain tissue resulting in swelling and pressure that damages the brain. An ischemic stroke occurs when a blockage develops in a blood vessel carrying blood to the brain.


A cryptogenic stroke is an ischemic stroke for which no definite cause is found. It is estimated that 25% to 30% of ischemic strokes are cryptogenic.

One possible factor that may have contributed to your cryptogenic stroke is the presence of a Patent Foramen Ovale.

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How does a PFO affect stroke risk?

Blood clots can develop in your veins for various reasons and travel to the right side of the heart. Normally, they are then pumped to the lungs, which act as a filter. However, a PFO can allow those clots to bypass the lungs and cross to the left side of the heart. From there, they can be pumped to the brain, causing a stroke.

Patients who have a PFO and have had a cryptogenic stroke may be at an increased risk for having a second stroke. In some patients, a second stroke can be prevented by having the PFO closed.

PFO Treatment options

If you have had a cryptogenic stroke and have also been diagnosed with a PFO, PFO closure with the Amplatzer PFO Occluder is a treatment option to reduce the risk of another stroke. After discussing the benefits and risks with your doctor, you can decide which treatment option is right for you. Treatments include:

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Blood-thinning medication

Your doctor may prescribe blood-thinning medication to reduce your chance of having blood clots. Aspirin (taken daily) is the recommended medication for most patients to reduce the risk of having another ischemic stroke. Some physicians recommend stronger blood-thinning medications called anticoagulants.

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Open heart surgery to close the PFO

Most open heart surgeries are performed through an incision across the full length of the breastbone or sternum. Open heart surgeries require the use of a heart-lung machine which takes over the function of the heart temporarily. Today, open heart surgery is rarely performed to close a PFO.

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PFO closure with the Amplatzer PFO Occluder

The Amplatzer PFO Occluder is a device that can be placed in your heart to close the PFO through a minimally invasive, catheter-based technique, and is designed to stop blood flow through the PFO.

Preventing recurring cryptogenic stroke with the Amplatzer PFO Occluder

The fear of having another stroke can be overwhelming. With the Amplatzer PFO Occluder, your doctor may be able to significantly reduce the risk of stroke recurrence. Researched extensively in clinical trials, the Amplatzer PFO Occluder has shown up to a 97% relative risk reduction for recurrent ischemic stroke when compared to medical management therapy.1

With a proven track record of more than 100,000 devices implanted globally over 20 years2, the Amplatzer PFO Occluder is relied upon by thousands of physicians around the world.

The Amplatzer PFO Occluder is a device specifically designed to stop blood flow through a PFO, reducing your risk of a recurring cryptogenic stroke. The device consists of two circular wire-mesh discs covered in a medical fabric that sandwich together to close the PFO between the two upper chambers in your heart (the left atrium and right atrium).

The wire mesh material can be collapsed down to fit a small tube (catheter) which is used to position the device during the procedure. Once the device is placed in the PFO, it will remain permanently implanted in your heart. Over time, the body’s natural healing process will cover the device with tissue.

Frequently asked questions

How do I know which treatment option is right for me?

Before implantation of the Amplatzer PFO Occluder, other potential causes for your past stroke should be ruled out by your neurologist and cardiologist. If no cause is identified for your stroke (that is, you have had a cryptogenic stroke) and you have been determined to have a PFO, this team of doctors may recommend the Amplatzer PFO Occluder for you.

Before undergoing PFO closure, your doctors will also evaluate specific factors that need to be considered for the implantation procedure itself including:

  • Your overall medical status
  • Suitability of your vessels and heart size and shape for the catheter-based procedure
  • Your suitability for general or local anesthesia
  • Your suitability to have ultrasound imaging of the heart
  • Your suitability for radiation exposure during the procedure that is necessary to implant the Amplatzer PFO Occluder
What do you need to do before the PFO closure procedure?

Be sure to talk with your doctor about any medication you may be taking. He/she might advise you to adjust your medications prior to the procedure. Your doctor may tell you not to eat or drink anything after midnight prior to the procedure. You should plan on making arrangements for a ride to and from the hospital, and arrange for help at home (if necessary) after the procedure.

What happens during the PFO closure procedure?

The PFO closure procedure will take place in a heart catheterization laboratory, where minimally invasive procedures are performed. Before beginning the procedure, you will receive a sedating medication to help you relax and local anesthetic so that you do not feel any significant discomfort. The catheter-based procedure involves making a very small skin incision (cut), typically in the right groin area, and inserting a small tube (called a catheter) to guide the Amplatzer PFO Occluder through the blood vessels to close the PFO within your heart.

Once the device is placed across the PFO, the cardiologist will carefully study its position using cardiac imaging tools. When the cardiologist is satisfied with the position of the Amplatzer PFO Occluder, the device will be released to remain permanently in the heart, all catheters will be removed and the implant procedure is complete. The procedure should last between one and two hours.

Watch the animation

What happens after the PFO closure procedure?

After the procedure, your medical team will discuss an after-care plan with you, and you should expect to be discharged from the hospital within 24 hours. Before you are discharged from the hospital, you will receive a patient identification card. You will be prescribed aspirin (81 to 325 mg) and clopidogrel (75 mg) to be taken daily for one month after the implant procedure, followed by daily aspirin (81 to 325 mg) alone for at least five additional months. Your doctor may prescribe additional medication (typically aspirin daily) beyond six months. You will have an echocardiogram at six months so that your doctor can make sure that your device is properly implanted.

Regular check-ups with your doctor are very important. Call or see your doctor whenever you have questions or concerns about your health. If you have any unusual problems such as bleeding, pain, other discomfort or changes in your overall health, be sure to contact your doctor.

Always carry your Amplatzer PFO Occluder implant card and tell other doctors that you have a PFO closure device before any medical, dental or MRI (magnetic resonance imaging) procedures. Failure to do so may result in health problems or damage to the device.

What risks are associated with the PFO closure procedure?

As with any medical procedure, there is a possibility of complications. The most serious risks of the procedure include:

  • Blood clot in the heart, leg or lung requiring long-term anticoagulation therapy
  • Blood or fluid build-up between the heart muscle and the sac that covers the heart requiring a drainage procedure
  • Death
  • Irregular and/or rapid heart rate (particularly atrial fibrillation)
  • Perforation of the heart muscle or vessels
  • Stroke (major or minor)

Additional potential risks associated with the procedure or the device include:

  • Allergic reaction to anesthesia
  • Allergic reaction to contrast dye used to visualize heart during the implant procedure
  • Allergic reaction to a drug used during the procedure
  • Allergic metal reaction: Nitinol (nickel, titanium), platinum/iridium, stainless steel (chromium, iron, manganese, molybdenum, nickel)
  • Arrhythmia (loss of regular heart rhythm)
  • Bleeding
  • Blood clot on device
  • Blood vessel blockage due to blood clots or air
  • Chest pain
  • Fever
  • Fluid buildup around lungs
  • Headache or migraine
  • Heart attack
  • Heart valve damage that interferes with valve closure
  • High or low blood pressure
  • Incomplete closure of PFO
  • Infection
  • Injury to the heart or vessels
  • Injury to the nerves in the arm or lower neck
  • Movement of the device from its position within the PFO or to other parts of the body
  • Sudden interruption of blood flow to an organ or body part
  • Surgery or intervention to remove the device
  • Trouble or inability to breathe


  • If you are prone to venous blood clots, your doctor may prescribe a blood thinning medication (usually an anticoagulant) for at least 6 months.
  • Talk to your doctor if you are allergic to nickel. The Amplatzer PFO Occluder is made of a metal called nitinol containing nickel and titanium.


Talk to your doctor if you are:

  • Pregnant
  • Have a history of multi-organ failure
  • Unable to take blood thinning medication
Who should not have the procedure?

The Amplatzer PFO Occluder should not be implanted in patients who:

  • Have a tumor or blood clots at the implantation site of the device or in the vessels through which the device is advanced to reach the heart
  • Have blood vessels too small to allow the delivery system to pass through
  • Have an anatomy in which the device would interfere with heart or vascular function
  • Have other types of heart defect
  • Have infection of the heart
  1. Mas J-L, Derumeaux G, Guillon B, et al. Patent foramen ovale closure or anticoagulation vs. antiplatelets after stroke. N Engl J Med 2017;377:1011-21 and supplementary appendix.
  2. Abbott (2018). Internal Sales Data 1996-2018.
MAT-2002496 v1.0 | Item approved for U.S. use only.

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