Aortic valve replacement is a major procedure, but it carries lower risk than most people expect. The 30-day mortality rate sits around 2.5% to 2.8% for both surgical and catheter-based approaches in low-risk patients, meaning roughly 97 out of 100 people survive the procedure itself. How serious it is for you specifically depends on your age, overall health, whether it’s planned or urgent, and which type of replacement you receive.
Two Types of Replacement, Two Levels of Invasiveness
There are two main ways to replace an aortic valve. Surgical aortic valve replacement (SAVR) is open-heart surgery: the surgeon opens your chest through the breastbone, stops the heart temporarily, removes the damaged valve, and sews in a new one. Transcatheter aortic valve replacement (TAVR) is far less invasive. A new valve is threaded through a blood vessel in the leg and guided into position inside the old valve, with no need to open the chest or stop the heart.
TAVR was originally reserved for patients too frail for open-heart surgery, but it’s now approved for patients at all risk levels. The short-term survival rates for both procedures are similar, but their long-term trajectories differ. In one study tracking patients for a decade, 37% of surgical patients were alive at 10 years compared to 18% of TAVR patients. That gap likely reflects the fact that TAVR patients tend to be older and sicker at baseline, not that the procedure itself is inferior. Your surgical team will recommend the approach that fits your risk profile.
What Determines Your Personal Risk
Surgeons use a standardized scoring system called the STS risk score to estimate how serious the procedure will be for a given patient. It factors in age, heart function (specifically how well the heart pumps with each beat), kidney health, lung disease, diabetes, history of stroke, and smoking history. The score produces a predicted mortality percentage that places you into one of three categories: low risk (4% or below), intermediate risk (4% to 8%), or high risk (above 8%).
Patients in the low-risk category tend to do very well with either approach. Those at intermediate or high risk may be steered toward TAVR to avoid the physical toll of open-heart surgery. The most important thing to understand is that aortic valve replacement is not one-size-fits-all. A healthy 65-year-old with no other medical problems faces a very different level of seriousness than an 82-year-old with kidney disease and prior strokes.
Elective vs. Urgent Procedures
Timing matters significantly. When aortic valve replacement is planned in advance, outcomes are substantially better than when it’s performed on an urgent or emergency basis. Urgent TAVR carries nearly twice the mortality risk compared to elective TAVR during the first year after the procedure. Patients who undergo urgent replacement also face higher rates of bleeding, kidney injury, and infection in the immediate recovery period.
The good news is that after the first year, survival rates between urgent and elective patients converge and become statistically comparable. Still, the overall survival advantage for elective procedures amounts to about 6.5 months of additional life over the full follow-up period. This is one reason doctors recommend replacement when symptoms first appear rather than waiting for a crisis.
Risks During and After the Procedure
The most concerning complication is stroke, which occurs in 1.3% to 6.2% of surgical replacements. The other significant risk is damage to the heart’s electrical system. Because the aortic valve sits close to the pathways that control your heartbeat, replacing it can disrupt those signals. Between 5% and 33% of TAVR patients need a permanent pacemaker afterward, while the rate for surgical replacement is lower, around 2% to 7%. Whether you end up on the low or high end of that range depends on the specific valve used and your anatomy.
Other possible complications include bleeding, infection, kidney problems, and in rare cases, the new valve leaking around its edges. These risks are real but manageable, and surgical teams monitor closely for all of them in the days following the procedure.
Recovery Timeline
Hospital stays differ dramatically between the two approaches. After open-heart surgery, expect about a week in the hospital. After TAVR, most patients go home in two to three days.
The longer recovery challenge after surgical replacement is healing the breastbone, which was split open during the operation. This typically takes six to eight weeks, during which you’ll need to avoid lifting anything heavy, driving, or pushing and pulling motions that stress the chest. Physical inactivity during this period is common, and many patients experience fatigue and reduced stamina that predates the surgery itself, since a failing aortic valve causes breathlessness and exhaustion for months or years before it’s replaced.
TAVR patients recover faster physically because there’s no chest incision, but both groups benefit from cardiac rehabilitation programs that gradually rebuild fitness and confidence. Return to work varies widely depending on your job and overall health, and there’s no strong evidence that formal rehab programs speed up that timeline compared to recovering on your own.
Choosing Between Mechanical and Tissue Valves
If you’re having surgical replacement, you’ll choose between a mechanical valve (made of synthetic materials) and a bioprosthetic valve (made from animal tissue, usually pig or cow). This choice involves a direct tradeoff between durability and lifestyle impact.
Mechanical valves last essentially a lifetime, but they require you to take blood-thinning medication (warfarin) every day for the rest of your life. That means regular blood tests to check your clotting levels, dietary restrictions around foods high in vitamin K, and an ongoing risk of bleeding complications. Bioprosthetic valves don’t require lifelong blood thinners, but they wear out. In patients over 65, they average about 15 years before they deteriorate enough to need replacement. In younger patients, the body’s stronger immune response and faster calcification can break down a tissue valve within a decade.
TAVR valves are all bioprosthetic, so the mechanical vs. tissue decision applies only to open-heart surgery. For younger patients who choose a tissue valve, the likelihood of needing a second procedure later in life is something to factor into the overall seriousness of the decision.
How Most People Feel Afterward
The majority of patients experience meaningful improvement in their symptoms. Most studies show an average improvement of at least one full functional class within 6 to 11 months, meaning someone who was breathless walking across a room might comfortably walk a few blocks. That improvement tends to hold or even increase over two to three years.
Not everyone improves, though. About one in five patients in one study saw no change in their symptoms or got worse after the procedure. Older patients with multiple health problems and those whose hearts have already suffered significant damage before surgery are more likely to fall into this group. The valve replacement fixes the mechanical problem, but it can’t reverse all the downstream effects that years of a malfunctioning valve may have caused.