A new device may reduce the risk of having a stroke.
What Is A Stroke?
A stroke is a “brain attack”. It can happen to anyone at any time. It occurs when blood flow to an area of brain is cut off. When this happens, brain cells are deprived of oxygen and begin to die. When brain cells die during a stroke, abilities controlled by that area of the brain such as memory and muscle control are lost. Strokes are medical emergencies.
How a person is affected by their stroke depends on where the stroke occurs in the brain and how much the brain is damaged. For example, someone who had a small stroke may only have minor problems such as temporary weakness of an arm or leg. People who have larger strokes may be permanently paralyzed on one side of their body or lose their ability to speak. Some people recover completely from strokes, but more than 2/3 of survivors will have some type of disability.
What Is It?
The approved Amplatzer PFO Occluder device reduces the risk of a stroke in patients who previously had a stroke believed to be caused by a blood clot that passed through a small hole in the heart, called a patent foramen ovale (PFO), and then traveled to the brain.
“The Amplatzer PFO Occluder provides a non-surgical method for doctors to close a PFO,” said Bram Zuckerman, M.D., director of the Division of Cardiovascular Devices in the FDA’s Center for Devices and Radiological Health. “But as the device labeling clearly states, patients need to be evaluated carefully by a neurologist and cardiologist to rule out other known causes of stroke and help ensure that PFO closure with the device is likely to assist in reducing the risk of a recurrent stroke.”
Who Should Get It?
About 25 to 30 percent of Americans have a PFO, which typically causes no health problems and does not require treatment. The cause of most strokes can be identified, such as poorly controlled high blood pressure, narrowed blood vessels due to cholesterol deposits and scar tissue (atherosclerosis), or a blood clot caused by an abnormal heart rhythm (atrial fibrillation). However, in some patients, medical tests cannot identify the cause of the stroke, which is referred to as a cryptogenic stroke. In a small percentage of these patients, it is believed that the PFO provided a path for a blood clot to travel to the brain where it blocked a blood vessel resulting in a stroke. Patients with a cryptogenic stroke and a PFO may be at an increased risk of having a second stroke.
How Is it Implanted?
The Amplatzer PFO Occluder is inserted through a catheter that is placed in a leg vein and advanced to the heart. It is then implanted close to the hole in the heart between the top right chamber (right atrium) and the top left chamber (left atrium). The device had been on the market more than a decade ago under a humanitarian device exemption (HDE), but was voluntarily withdrawn by the manufacturer in 2006 after the FDA concluded that the target population for this device was greater than 4,000 patients and that the device no longer qualified for an HDE approval. For the past 10 years, no FDA-approved heart occluder devices have been on the market specifically indicated to close PFOs to reduce the risk of a recurrent stroke in patients with a prior cryptogenic stroke.
In approving the Amplatzer PFO Occluder, the FDA concluded that the device demonstrated a reasonable assurance of safety and effectiveness. The safety and efficacy was assessed in a randomized study that evaluated 499 participants aged 18 to 60 years old who were treated with the Amplatzer PFO Occluder plus blood-thinning medications compared to 481 participants who were treated with blood-thinning medications alone. While the rate of new strokes in both treatment groups was very low, the study found a 50 percent reduction in the rate of new strokes in participants using the Amplatzer PFO Occluder plus blood-thinning medications compared to participants taking only blood-thinning medications.
Adverse effects associated with the device or the implantation procedure include injury to the heart, irregular and/or rapid heart rate (atrial fibrillation), blood clots in the heart, leg or lung, bleeding and stroke.
The Amplatzer PFO Occluder device should not be used in patients with a heart valve infection or other untreated infections, or a heart tumor or blood clot at the implant site. The device is also contraindicated in patients with other abnormal connections between the heart chambers or in whom the cardiovascular anatomy or blood clots would interfere with the ability to move the catheter used to deliver the device to the heart.
Patients should discuss with their medical team (consisting of a neurologist and a cardiologist) the risks and benefits of PFO closure in comparison to using medications alone.
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