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How TAVR Can Help Intermediate- and High-Risk Aortic Stenosis Patients

By

Dharam Kumbhani, MD

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About 5 million Americans are diagnosed with some form of heart valve disease every year, according to the American Heart Association. Because heart valve disease is degenerative and our population is aging as baby boomers move into retirement, the number of cases is likely to increase. Some heart valve issues are related to congenital heart defects at birth, but the vast majority of cases occur in people 65 years of age and older.

One of the most common forms of heart valve disease is called aortic stenosis, a narrowing of the aortic valve opening caused by scarring and calcium build up. Narrowing of the aortic valve can restrict the amount of blood exiting the heart and result in serious medical consequences, including heart attack and death. Typically, aortic stenosis is a slowly progressive disease, with milder forms detectable in patients nearly a decade before they become symptomatic. Many patients remember being told they have a “murmur” by a physician several years before the onset of symptoms. When patients start experiencing symptoms, though, the valve narrowing is typically significant.

The most common initial complaint with aortic stenosis is breathlessness. In addition to being short of breath after normal activities, patients with aortic stenosis may also experience chest pain (also called angina). Fainting, or syncope, is another warning sign that should encourage patients to seek medical attention. Once symptoms of aortic stenosis develop, early intervention is very important--in fact, without any treatment, the five-year survival rate is less than 5%. However, treatment improves this statistic significantly.

The good news for my patients is that we have several effective treatment options for aortic stenosis. Open-heart surgery using various types of replacement valves has been practiced successfully since the 1960’s, and new options have emerged that are less invasive and very effective. Today’s aortic stenosis patient can generally expect an outcome that enhances both the quality of his or her life and the longevity.

Treating Aortic Stenosis With Transcatheter Aortic Valve Replacement

In recent years, with the advent of less-invasive technology, it has become more practical to treat many patients with a procedure called transcatheter aortic valve replacement (TAVR). TAVR is also known as TAVI, or transcatheter aortic valve implantation. In this procedure, a folded replacement valve is placed inside a catheter (a long flexible tube). The catheter is typically inserted through the groin, where it travels through an artery to the heart. Once it reaches the aortic valve, the new valve frame then replaces the diseased valve and begins working right away. The catheter is then removed and the groin entry site is carefully closed.

TAVR was initially developed for patients for whom open-heart surgery would be too risky. Valve replacement in open-heart surgery involves literally cracking open the patient’s chest (sternotomy) under general anesthesia and putting the patient on a heart-lung machine. In the best-case scenario, it involves significant hospitalization, rehabilitation and weeks to months of recovery time. A significant group of elderly patients (as many as a third of all patients with aortic stenosis in some studies) were simply too frail to survive the procedure, so they were left without a meaningful treatment option for their aortic valve disease. The TAVR procedure is a form of “beating heart” surgery (in which the heart is never stopped or slowed), performed without a sternotomy or the need for a heart-lung machine, and patients can be discharged home in a couple of days. TAVR thus represents a revolution for this group of patients, who were literally given a new lease on life. TAVR has since been approved for patients who could receive open-heart surgery but are at high risk of complications, and more recently, for patients with only an intermediate risk of complications. Risk estimation is determined by physicians using a combination of clinical judgement and readily available risk calculators.



THIS CONTENT DOES NOT PROVIDE MEDICAL ADVICE. This content is provided for informational purposes and reflects the opinions of the author. It is not a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified healthcare professional regarding your health. If you think you may have a medical emergency, contact your doctor immediately or call 911.


Dharam Kumbhani, MD

Dharam Kumbhani, MD, is an interventional cardiologist at the University of Texas Southwestern Medical Center, where he is part of the TAVR team. Dr. Kumbhani wrote the standardized guidelines for this procedure for the American College of Cardiology. View his Healthgrades profile >

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