AVR stands for aortic valve replacement, a procedure that removes a damaged or diseased aortic valve and replaces it with a new one. It is one of the most common heart surgeries performed today, primarily used to treat severe aortic stenosis (a narrowed valve that restricts blood flow) or severe aortic regurgitation (a leaky valve that allows blood to flow backward). There are two main approaches: traditional open-heart surgery (SAVR) and a newer, less invasive catheter-based method (TAVR).
Why the Aortic Valve Matters
The aortic valve sits between the heart’s main pumping chamber and the aorta, the large artery that delivers blood to the rest of your body. Every time your heart beats, this valve opens to let blood through, then closes to prevent it from leaking back. When the valve becomes too narrow or too leaky, the heart has to work much harder to push blood forward. Over time, that extra strain weakens the heart muscle and causes symptoms like shortness of breath, chest pain, and fainting.
When AVR Is Recommended
Most people who need AVR have severe aortic stenosis. The American Heart Association defines “severe” as a valve opening of 1 square centimeter or less (a healthy valve is 3 to 4 square centimeters), a pressure difference across the valve of 40 mmHg or more, or blood flowing through the valve at speeds above 4.0 meters per second. Once symptoms appear, the condition can deteriorate quickly, so surgery is typically recommended promptly.
For severe aortic regurgitation, replacement is indicated when symptoms are present or when the heart’s pumping function drops below 55%, even without symptoms. In some asymptomatic patients, surgery may be considered if the heart is enlarging significantly on repeated imaging studies.
Asymptomatic patients with severe stenosis may also qualify for AVR if their valve disease is progressing rapidly, if blood flow speed exceeds 5.0 meters per second, or if they’re already having heart surgery for another reason.
Surgical AVR (SAVR)
The traditional approach is open-heart surgery. The surgeon makes an incision through the breastbone (a median sternotomy), connects the patient to a heart-lung machine that temporarily takes over circulation, and stops the heart. This allows the surgeon to open the aorta, remove the damaged valve, and sew in a replacement. The heart is then restarted, and the breastbone is wired back together.
Outcomes for SAVR have improved dramatically. At high-volume centers, the operative mortality rate for low-risk patients is under 0.5%. Cleveland Clinic data shows post-SAVR survival of 98% at one year, 91% at five years, and 82% at nine years. Most patients spend roughly a week in the hospital afterward, with full recovery taking six to twelve weeks depending on age and overall health.
Transcatheter AVR (TAVR)
TAVR delivers a new valve through a catheter, usually threaded up through an artery in the groin. There’s no need to open the chest or stop the heart. The replacement valve is compressed onto a balloon or self-expanding frame, guided into position inside the old valve, and expanded into place. The procedure typically takes one to two hours, and many patients go home within a day or two.
TAVR was originally reserved for patients too frail for open-heart surgery, but it has steadily expanded to include moderate- and lower-risk patients. Recent meta-analyses of randomized trials comparing TAVR to SAVR in lower-risk patients show similar survival outcomes, though each approach carries a slightly different risk profile. TAVR tends to have lower rates of bleeding and faster recovery, while SAVR may have advantages in terms of long-term valve durability and lower rates of certain complications like valve leakage around the replacement.
Mechanical vs. Tissue Valves
If you’re having SAVR, one of the biggest decisions is what type of replacement valve to use. There are two main options.
Mechanical valves are made from durable synthetic materials and essentially last a lifetime. In a large Veterans Affairs trial tracking patients for 15 years, primary valve failure with mechanical valves was virtually zero. The tradeoff is significant: you’ll need to take a blood thinner (warfarin) every day for the rest of your life to prevent clots from forming on the valve. That means regular blood tests to keep your clotting levels in the right range, typically an INR target of 2.5 for a mechanical aortic valve, or 3.0 for patients at higher clotting risk.
Tissue (bioprosthetic) valves are made from animal tissue, usually from a pig or cow. They don’t require lifelong blood thinners, and many patients with a tissue valve in normal heart rhythm need only aspirin long-term. The downside is that tissue valves wear out. In the same Veterans Affairs study, primary valve failure at 15 years was 26% in patients under 65 and about 9% in patients 65 and older. This means younger patients with a tissue valve may eventually need a second procedure.
Age plays a central role in this decision. Younger patients often receive mechanical valves to avoid reoperation, while older patients tend to get tissue valves to avoid the burden and bleeding risks of lifelong blood thinners. TAVR valves are all tissue-based, and their long-term durability beyond 10 to 15 years is still being studied.
Risks and Complications
All forms of AVR carry surgical risks, though serious complications are uncommon at experienced centers. The most notable risks include:
- Stroke: A small risk with both SAVR and TAVR, caused by debris or clots reaching the brain during the procedure.
- Irregular heartbeats: New rhythm problems, particularly a fast or chaotic rhythm in the upper chambers, are common in the days after surgery and usually resolve with treatment. TAVR carries a higher risk of needing a permanent pacemaker afterward.
- Bleeding: More common with open surgery than with TAVR, given the larger incision and use of the heart-lung machine.
- Infection: Rare but serious, particularly if the new valve itself becomes infected.
- Valve-related problems: Leaking around the new valve (paravalvular leak) is more common with TAVR. Valve failure or structural problems can occur with either approach over time.
Life After Valve Replacement
Recovery from SAVR generally involves several weeks of limited activity while the breastbone heals. Most people are driving within four to six weeks and back to normal activities by two to three months. TAVR recovery is faster, with many patients resuming light activities within days.
If you receive a mechanical valve, managing your blood thinner becomes a permanent part of daily life. You’ll have regular blood draws to check your clotting levels, and you’ll need to be cautious about foods, medications, and activities that affect bleeding risk. With a tissue valve and a normal heart rhythm, the medication burden is much lighter, often just a daily aspirin.
Regardless of valve type, you’ll need periodic follow-up with echocardiograms to monitor how the new valve is functioning. The risk of blood clots forming on a tissue valve is roughly 0.7% per year for patients in normal rhythm, which is low but not zero. Most people report significantly improved energy and quality of life after recovery, particularly those who had been living with symptoms of severe valve disease before surgery.