Surgical aortic valve replacement, or SAVR, is an open-heart operation that removes a diseased aortic valve and replaces it with an artificial one. It’s the traditional surgical approach for treating severe aortic valve disease, most commonly aortic stenosis, a condition where the valve narrows and restricts blood flow out of the heart. The procedure carries a 30-day mortality rate of roughly 1.4% in low-risk patients, making it one of the more well-established cardiac surgeries performed today.
Why the Aortic Valve Needs Replacing
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. In a healthy heart, this valve opens wide with each heartbeat and snaps shut to prevent backflow. When the valve stiffens or calcifies, typically from age-related wear or from being born with a valve that has two flaps instead of the normal three, it can’t open fully. The heart has to work harder to push blood through the narrowed opening.
Doctors classify aortic stenosis as severe when the valve opening shrinks below 1.0 square centimeters (a healthy valve opening is 3 to 4 square centimeters) or when the pressure difference across the valve reaches 40 mmHg or higher. At that point, the heart is straining significantly with every beat. Symptoms like chest pain, fainting, and shortness of breath during activity signal that the valve disease has progressed to a dangerous stage. Without treatment, severe symptomatic aortic stenosis has a poor prognosis.
How the Surgery Works
SAVR is performed through open-heart surgery. The surgeon makes an incision down the center of the chest, from just below the Adam’s apple to just above the navel, then cuts the breastbone in half lengthwise and spreads it apart to access the heart directly.
Because the surgeon needs to work on the valve itself, your heart has to be temporarily stopped. Tubes are placed into the heart to reroute blood through a heart-lung bypass machine, which takes over the job of pumping blood and delivering oxygen to your body. Once the bypass machine is running, the surgeon injects the heart with a cold solution to stop it. The diseased valve is then cut out and replaced with an artificial one, which is sewn into place. After the new valve is secured, the heart is restarted, the bypass machine is disconnected, and the breastbone is wired back together.
The entire operation typically takes two to four hours, though this varies depending on complexity and whether any additional procedures, like coronary artery bypass, are performed at the same time.
Mechanical vs. Biological Valve Options
You’ll receive one of two types of replacement valve, and the choice has major implications for your life after surgery.
- Mechanical valves are made from durable synthetic materials like carbon and titanium. They last 20 to 30 years, which for many patients means the rest of their life. The tradeoff: blood clots form more easily on mechanical surfaces, so you’ll need to take a blood-thinning medication (warfarin) every day for the rest of your life. That means regular blood tests to check your clotting levels and dietary adjustments to keep the medication working consistently.
- Biological (bioprosthetic) valves are made from animal tissue, usually from a pig or cow. They don’t require lifelong blood thinners because the tissue surface is less prone to clot formation. The downside is durability. These valves typically last 10 to 15 years before they begin to deteriorate. About 17% of patients show structural valve deterioration at the 10-year mark, and that number climbs to roughly 37% by 15 years. If you’re younger when you receive a biological valve, you’ll likely need a second procedure down the road.
The decision between these two options depends largely on age. Younger patients often benefit from a mechanical valve’s longevity despite the commitment to blood thinners. Older patients frequently choose biological valves to avoid the daily medication burden and bleeding risks that come with anticoagulation therapy.
SAVR Compared to TAVR
Transcatheter aortic valve replacement, or TAVR, is a newer, less invasive alternative. Instead of opening the chest, a cardiologist threads a catheter through a blood vessel in the leg and guides a collapsible replacement valve up to the heart, where it’s expanded inside the old valve. There’s no bypass machine and no breastbone incision, which means a shorter hospital stay and faster recovery.
In terms of valve durability over medium-term follow-up (two to eight years), studies show similar rates of structural valve deterioration between SAVR and TAVR. However, TAVR patients face roughly twice the rate of reintervention, meaning a second procedure to address problems with the replacement valve. TAVR valves also show higher rates of significant leak around the replacement valve compared to surgically placed ones.
TAVR was originally reserved for patients too sick or elderly for open-heart surgery. It has since expanded to lower-risk patients, but SAVR remains the preferred option for younger, healthier patients who need maximum long-term durability and who can tolerate the more demanding recovery.
Risks and Complications
For low-risk patients undergoing isolated SAVR, the 30-day mortality rate is about 1.4%, based on data from the Society of Thoracic Surgeons national registry covering roughly one million procedures. The stroke rate during or shortly after surgery runs about 1.2% to 2.5%, depending on how stroke is defined and measured. Some studies using brain imaging after surgery have detected small, clinically silent strokes in a much higher percentage of patients, though these don’t cause noticeable symptoms.
Other potential complications include infection at the incision site or on the new valve, irregular heart rhythms (some patients need a permanent pacemaker afterward), bleeding requiring a return to the operating room, and kidney problems from the stress of the bypass machine. The risk profile increases for patients who are older, have other medical conditions, or need additional procedures during the same operation.
Recovery After SAVR
Most people spend about a week in the hospital after SAVR, with the first day or two in an intensive care unit. You’ll have a breathing tube when you wake up, which is typically removed within hours once you’re breathing well on your own. Chest tubes drain fluid from around the heart for the first few days.
Full recovery takes one to three months for most people. The breastbone needs about six to eight weeks to heal, and during that time you’ll be told to avoid lifting anything heavy, driving, or pushing and pulling motions that stress the chest. Cardiac rehabilitation, a supervised exercise program, usually starts a few weeks after discharge and helps rebuild stamina gradually. Most people return to work within several weeks to a few months, depending on how physically demanding their job is.
If you received a mechanical valve, you’ll start warfarin in the hospital and continue it indefinitely. If you received a biological valve, you may take a blood thinner for a short period after surgery before transitioning off it. Either way, you’ll have regular follow-up appointments with echocardiograms to monitor how the new valve is functioning, typically annually once you’ve fully recovered.