HEALTH + WELLNESS
FILTERING OUT THE
RISK OF STROKE story by Brian Blaker, MD, FACC, McLeod Interventional Cardiologist
The aortic valve is one of the four heart valves that control the flow of blood through the heart. Aortic stenosis is a disease characterized by severe narrowing of the valve that directs blood flow out of the heart. It most commonly affects those patients over the age of 65. Over time, the three flaps on the aortic valve that open and close to control the blood flow can become stiff from a buildup of scar tissue and calcium. This reduces the motion of the valve and its ability to open sufficiently to allow for good blood flow out of the heart. When this happens, the heart needs to work harder to move blood throughout the body. Common symptoms of aortic stenosis include chest pain, shortness of breath, dizziness, passing out, fatigue, or decrease in exercise tolerance. The disease is usually identified by a non-invasive study called an echocardiogram, or ultrasound of the heart. For those patients who are found to have severe aortic stenosis and experience symptoms such as those described above, the only effective treatment is to replace the aortic valve. Transcatheter Aortic Valve Replacement (TAVR), a minimally invasive procedure being performed at McLeod Regional Medical Center, allows physicians to replace a patient’s diseased or damaged heart valve without removing the old valve. For some patients, particularly older patients and those with medical conditions that make them a poor candidate for open heart surgery, this procedure is an alternative option to traditional surgical aortic valve replacement. TAVR is performed in a similar manner as a heart catheterization. The physician inserts a catheter, a long flexible thin tube with the artificial valve, through a small incision in the groin, then guides it to the heart using X-ray imaging. The valve is precisely positioned across the diseased valve. The new valve is then deployed and starts functioning immediately. 38
VIPMagSC.com
September 2021
A demonstration of how Cerebral Protection System filters are positioned in the heart’s main arteries to capture the debris dislodged during a TAVR procedure.
While TAVR can save lives and significantly improve quality of life, like all medical procedures, it involves a small amount of risk. One of the risks of many valve procedures is a stroke. A stroke results when there is interruption in the blood supply to an area of the brain. TAVR is comparable with surgical alternatives in terms of effectiveness and safety, however, there is still a risk that pieces of the damaged heart valve can break loose during the procedure, travel through the arteries toward the brain, and potentially cause a stroke. To reduce the risk of stroke, a Cerebral Protection System can be utilized in many patients to capture debris dislodged during the TAVR procedure before it reaches the brain and potentially causes brain injury and stroke. The Cerebral Protection System uses embolic filters, which allows the blood to still circulate through to the brain, while trapping debris or blood clots. Before the TAVR procedure begins, the device is delivered though
