Pacemaker After TAVR: Why Some Patients Need One and How Likely It Is

A permanent pacemaker is needed after TAVR in roughly 10 to 20 percent of cases, because the new valve sits millimetres from the heart’s electrical wiring and expanding it can bruise or block those fibres. When I was wheeled back to the ward after my own procedure, the first thing anyone talked about was not my valve at all, it was my heart rhythm, and the little monitor that stayed clipped to me for the next two days. This is the plain explanation of why that happens, how likely it is, who it happens to, and what it means if you turn out to be one of them.

Why TAVR can affect the heart’s rhythm

TAVR can disturb the heart’s rhythm because the aortic valve sits directly above the bundle of specialised fibres that carry the heartbeat’s electrical signal, and the frame of the new valve presses on that area as it expands. The signal that tells your heart to beat travels from the natural pacemaker at the top of the heart, down through a junction called the atrioventricular node, and along a cable of fibres called the bundle of His, which runs right beneath the aortic valve ¹.

When the metal frame of a TAVR valve is opened inside the old, calcified valve, it can push on or bruise those fibres. Most of the time the effect is temporary. Sometimes it slows or blocks the signal enough that the heart cannot hold a reliable rhythm on its own, and that is when a permanent pacemaker, a small device that sends its own electrical prompts, is fitted ². One thing is worth saying plainly straight away: needing a pacemaker does not mean the valve has failed or that something went wrong. The valve can be working perfectly while the wiring beside it needs a hand. The broader set of things that can happen is set out honestly in TAVR risks and complications.

How common a pacemaker is after TAVR

Across all TAVR patients, somewhere between about 10 and 20 percent need a permanent pacemaker, but the figure depends heavily on which valve is used. In the PARTNER 3 trial, which used a balloon-expandable valve in lower-risk patients, the rate of a new permanent pacemaker within 30 days was about 6.6 percent ³. In the Evolut Low Risk trial, which used a self-expanding valve, the equivalent figure was higher, at around 17 percent ⁴.

That gap is one of the most consistent findings in the field: self-expanding valves, which tend to sit a little deeper and exert a steady outward force, have needed a pacemaker more often than balloon-expandable ones ⁴. Newer valve designs and implantation techniques have narrowed the difference, but it has not vanished. The most common electrical change of all is not a full block but a new left bundle branch block, a partial delay in the wiring, which appears in roughly 20 to 30 percent of patients and often needs only monitoring rather than a device ¹.

Who is most likely to need one

The single strongest predictor of needing a pacemaker after TAVR is a pre-existing right bundle branch block, a wiring delay that is already present before the procedure. If one side of the electrical cable is already running slow and the procedure then disturbs the other side, the heart can be left without a dependable route for the signal ⁵.

Other things raise the odds too: how deeply the valve is implanted below the natural valve, heavy calcium in that specific spot, the type of valve as above, and certain rhythm abnormalities already visible on the ECG ⁴. This is part of why the heart team studies your ECG and CT scan so closely beforehand, one of the assessments described in working out whether you are a candidate for TAVR. None of these guarantees a pacemaker, and plenty of people with a risk factor never need one; they simply shift the odds.

How it is picked up: the monitoring afterwards

After TAVR you are watched continuously on a heart monitor, usually for at least 24 to 48 hours, precisely so that any dangerous slowing of the rhythm is caught the moment it appears. This is the telemetry that dominated my own first two days: a small box clipped to my gown, wires to pads on my chest, and a screen at the nurses’ station tracing every beat.

Most conduction problems that are going to need a pacemaker show up early, in the first few days ². If the monitor reveals a high-grade block, the team will usually place the pacemaker before you go home, which can add a day or two to what is otherwise a 1 to 3 day stay. If the tracing stays clean, the monitoring simply comes off and you go home on the normal timeline described in what recovery actually looks like. In my case the wires came off on the second morning and nobody ever mentioned a pacemaker again, but by then I understood why they had watched so carefully.

What a pacemaker means for the rest of your life

If you do need a pacemaker, it is a small, well-established device fitted under the skin below the collarbone, and for most people it settles into the background of daily life within a few weeks. Fitting it is a separate minor procedure, usually under local anaesthetic, and it becomes another part of the long routine of living with a replaced valve ².

It does add a little lifelong admin: the device is checked periodically, either in a clinic or remotely, and you carry a card that identifies it, which matters for certain scans and at airport security. That sits alongside the other habits of living with a heart valve, the yearly echocardiogram and telling every dentist about your prosthetic valve. A pacemaker does not shorten the durability of the TAVR valve itself, and the two devices do their separate jobs quite happily side by side.

Can the risk be reduced?

The risk of needing a pacemaker can be lowered, though not removed, mainly through valve choice and by implanting the valve as high as the anatomy safely allows. Placing the valve less deeply, so its frame sits further from the conduction fibres, has been shown to reduce the rate of new pacemakers, and this higher implantation technique is now widely used ⁴.

Where the risk is judged to be high, for example in someone who already has a right bundle branch block, the team folds that into the whole decision, including which valve to use and whether a keyhole procedure or an operation is the better route overall, a comparison covered in TAVR versus open-heart surgery. None of this is something to manage yourself; it is exactly the kind of detail your own heart team balances against everything else in your particular case.

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General information, not medical advice. Conduction problems and pacemaker rates vary with the valve, the anatomy and the individual, and whether any of this applies to you is a decision for your own cardiologist and heart team, who can examine you and read your scans.