TAVR Risks and Complications: The Honest Numbers
Key takeaways
- TAVR is a low-mortality procedure in modern practice: around 1 to 2% of lower-risk patients die within 30 days, but it is a real cardiac procedure with real risks.
- Stroke happens in roughly 2 to 3% of cases around the time of the procedure.
- A new permanent pacemaker is needed in about 10 to 20% of cases, and more often, roughly 15 to 25%, with self-expanding valves, because the valve can press on the heart's wiring.
- A small leak around the valve (paravalvular leak) can occur, as can vascular and bleeding complications at the groin access site.
- Serious complications overall are uncommon but not rare, which is exactly why a heart team weighs them against the danger of leaving severe aortic stenosis untreated.
Published
TAVR is a low-mortality procedure in modern practice, with around 1 to 2% of lower-risk patients dying within 30 days, but it is still real heart surgery through a catheter and it carries real, specific risks that deserve plain numbers rather than reassurance. The honest ones are stroke at roughly 2 to 3%, a new pacemaker in 10 to 20% of cases, a possible leak around the valve, and access-site problems in the groin. I found the exact figures far less frightening than the vagueness they replaced. For the procedure in full, see what TAVR is.
30-day mortality: around 1 to 2% in lower-risk patients
Death within 30 days of TAVR is uncommon in contemporary practice, at about 1 to 2% for lower-risk patients, and higher in those who are older, frailer, or sicker to begin with. This figure comes from the low-risk trial programmes that expanded TAVR across the risk spectrum 1. The number matters most when set against the alternative: severe symptomatic aortic stenosis left untreated has a poor outlook, with survival often quoted around 50% at two years 2.
That contrast is the whole reason the procedure is offered. When my own cardiologist gave me the risk figure, it was the untreated outlook, not the procedure, that concentrated my mind.
Stroke: roughly 2 to 3% around the procedure
Stroke is one of the most serious risks of TAVR and occurs in roughly 2 to 3% of cases around the time of the procedure. It can happen when small pieces of calcium or debris are dislodged as the valve is crossed and the new one deployed 3. Most procedures cause no stroke, and the risk has been studied closely across the major trials, but it is not zero and should never be softened into “rare” 1.
This is the risk I asked the most questions about. It is a fair thing to raise directly with your team, including how they work to reduce it.
New pacemaker: about 10 to 20%, higher with self-expanding valves
A new permanent pacemaker is needed in about 10 to 20% of TAVR patients overall, and more often, roughly 15 to 25%, when a self-expanding valve is used. The aortic valve sits right next to the heart’s electrical conduction system, and expanding the new valve can press on or bruise that wiring, slowing the heartbeat enough to need a pacemaker 4. This is a genuine difference between the two main valve designs and is one of the trade-offs your team weighs when choosing a valve 5.
It is why your heart rhythm is watched carefully in the days after the procedure. A pacemaker is not a failure of the operation; it is a known and manageable outcome, but you deserve to know the odds before you consent.
Paravalvular leak and access-site complications
A small gap can be left around the new valve, called a paravalvular leak, and the groin access site can bruise, bleed, or occasionally be damaged. Because TAVR expands the new valve inside the old one rather than removing it, the seal is not always perfect, and a leak lets a little blood pass back around the valve 2. Careful sizing from the pre-procedure CT scan is aimed at minimising this. Vascular and bleeding complications at the femoral artery are the other main group, which is why you lie flat afterwards and the site is closely watched 3.
Serious complications overall are uncommon but not rare, and that precise wording is the point. To see how these risks are weighed against your age, anatomy, and surgical risk, read am I a candidate for TAVR.
General information, not medical advice. Your personal risk depends on your age, your anatomy, and your other conditions, and weighing these complications against the alternatives is a decision for your own heart team.
References
- Transcatheter Aortic-Valve Replacement with a Balloon-Expandable Valve in Low-Risk Patients (PARTNER 3), New England Journal of Medicine. ↩
- 2020 ACC/AHA Guideline for the Management of Patients With Valvular Heart Disease, American College of Cardiology / American Heart Association. ↩
- TAVI (transcatheter aortic valve implantation), British Heart Foundation. ↩
- Transcatheter Aortic-Valve Replacement with a Self-Expanding Valve in Low-Risk Patients (Evolut Low Risk), New England Journal of Medicine. ↩
- 2021 ESC/EACTS Guidelines for the Management of Valvular Heart Disease, European Society of Cardiology / EACTS. ↩
Common questions
What is the death rate for TAVR?
In contemporary practice the 30-day mortality is around 1 to 2% for lower-risk patients, which is low for a heart-valve procedure. It is higher in people who are older, frailer, or sicker to begin with, which is part of why candidacy is judged individually. For context, severe symptomatic aortic stenosis left untreated carries a far worse outlook, with survival often quoted around 50% at two years.
What is the risk of stroke with TAVR?
Roughly 2 to 3% around the time of the procedure. A stroke can happen when debris is dislodged as the valve is crossed and deployed. It is one of the most serious complications, which is why it is discussed frankly beforehand and why research into protection devices and technique continues. Most TAVRs cause no stroke, but the risk is not zero and should not be glossed over.
Why do some people need a pacemaker after TAVR?
The aortic valve sits very close to the heart's electrical conduction system. When the new valve is expanded it can press on or bruise that wiring, slowing the heartbeat enough to need a permanent pacemaker. This happens in about 10 to 20% of cases overall, and more often, roughly 15 to 25%, with self-expanding valves. The team monitors your rhythm closely in the days afterwards for exactly this reason.
What is a paravalvular leak?
It is a small gap between the new valve and your own tissue that lets a little blood leak backwards around the valve, rather than through it. The old valve is not removed in TAVR, so the fit is not always perfectly sealed. Mild leaks are often tolerated well; a more significant leak may need treatment. Careful sizing from the CT scan beforehand is aimed at keeping this to a minimum.
Is TAVR safer than open-heart surgery?
It is not simply safer or riskier: it trades one risk profile for another. TAVR avoids the sternotomy and heart-lung machine and generally means a shorter stay and quicker recovery, but it carries a higher rate of needing a pacemaker and of paravalvular leak. Open surgery has its own risks. Which balance suits you depends on your age, anatomy, and surgical risk, and that is the heart team's judgement.
What are the risks at the groin where the catheter goes in?
The femoral artery access can bruise, bleed, or occasionally be damaged, which is why you lie fairly flat for a few hours and the site is watched closely. Most people get only a large bruise that settles over a couple of weeks. Serious vascular complications are uncommon but are one reason the arteries are carefully assessed on the CT scan before the procedure is planned.
Written by Diane Farrow. Medically reviewed by Dr. Helena Voss, MD, FESC.
Our guides are written from personal experience and reviewed by a qualified clinician for accuracy. Read our editorial policy.
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Am I a Candidate for TAVR? The Heart Team, the CT Scan, and How the Decision Is Made · TAVR vs Open-Heart Surgery: Who Gets Which and What the Trials Showed · Types of Heart Valves: Tissue, Mechanical, and the TAVR Designs · TAVR Recovery: The Timeline From Discharge to Back to Normal · How Long Does a TAVR Valve Last? Durability and the Second Procedure