Pacemaker Implantation

Introduction

If your cardiologist has recommended a pacemaker, you are likely thinking through several questions at once. What exactly will be placed inside your chest? How is the procedure done? How long will recovery take? What will daily life look like afterwards?

A pacemaker is a small, battery-powered device that helps the heart maintain a steady rhythm when its own electrical system is not working reliably. Pacemaker implantation is one of the most commonly performed cardiac procedures in the world, and for many people with slow or irregular heart rhythms, it restores energy, reduces dizziness or fainting, and lowers the risk of serious complications.

This guide walks through what a pacemaker is, why doctors recommend one, the different types of devices, how the procedure is performed, what recovery typically looks like, the risks involved, and what life with a pacemaker is generally like over the long term. It is written for readers who have been told they may need a pacemaker or who are preparing for the procedure.

What Is Pacemaker Implantation?

Pacemaker implantation is a procedure in which a small electronic device — the pacemaker — is placed under the skin of the upper chest, usually just below the collarbone. Thin insulated wires called leads connect the device to the inside of the heart. The pacemaker monitors the heart’s natural electrical activity and delivers gentle electrical impulses when the heart beats too slowly or pauses.

• Pulse generator — the small metal case containing the battery and the computer circuitry that senses the heart rhythm and generates impulses.
• Leads — one, two, or three insulated wires that carry electrical signals between the pulse generator and the heart muscle.

• Electrodes — the tips of the leads, which rest against the inner wall of the heart and deliver the impulses.

   

An important point: a pacemaker does not take over the heart. It works on demand. It watches the heart’s own rhythm continuously and only fires an impulse when the heart misses a beat or slows below a programmed threshold. When the heart is beating normally, the pacemaker stays quiet.

The technical term doctors use for an unusually slow heart rhythm is bradycardia. When the heart’s upper and lower chambers do not communicate electrically as they should, the condition is called heart block. Pacemakers are designed to manage exactly these kinds of problems.

Why Is Pacemaker Implantation Performed?

Pacemakers treat problems with the heart’s electrical system. The heart has its own natural pacemaker — a small group of cells called the sinoatrial (SA) node — that sets the pace. From there, electrical signals travel through specialised pathways to the lower chambers, causing the heart muscle to contract in a coordinated way. When this electrical wiring slows down, gets blocked, or misfires, the heart cannot pump efficiently, and symptoms appear.

The heart's electrical conduction system showing: ① sinoatrial (SA) node, ② atrioventricular (AV) node, ③ bundle of His, ④ left and right bundle branches, ⑤ Purkinje fibres.

*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.

Doctors most commonly recommend pacemaker implantation for the following conditions:

• Symptomatic bradycardia — a persistently slow heart rate that causes fatigue, breathlessness, light-headedness, or fainting.
• Sick sinus syndrome — a condition in which the heart’s natural pacemaker becomes unreliable, alternating between slow and sometimes fast rhythms.
• Atrioventricular (AV) block — a delay or failure in the electrical signal travelling between the upper and lower chambers of the heart. Higher-degree AV block is one of the most common reasons for a pacemaker.
• Atrial fibrillation with slow ventricular response — when the heart’s upper chambers fibrillate and the lower chambers respond too slowly, sometimes worsened by rhythm-control medications.
• Recurrent unexplained fainting (syncope) when investigations point to a rhythm cause.
• Certain rhythm problems after a heart attack or after cardiac surgery, where the conduction system is damaged.
• Heart failure with a specific electrical pattern, where a specialised type of pacemaker (cardiac resynchronisation therapy) helps the heart pump more efficiently.

Current guidance from the American College of Cardiology, the American Heart Association, the Heart Rhythm Society, and the European Society of Cardiology generally recommends a pacemaker when a slow or blocked rhythm is causing symptoms, or when the electrical problem itself carries a high risk of dangerous pauses even without symptoms. The decision is based on the specific rhythm abnormality, the symptoms, and the results of tests such as an ECG, Holter monitor, or electrophysiology study.

Who Is a Candidate?

The right candidate for a pacemaker is someone whose symptoms or rhythm problem is unlikely to resolve on its own and is not better treated by adjusting medications or by another procedure.

Common candidate profiles include:

• Older adults with age-related slowing of the heart’s conduction system.
• People with high-degree AV block, regardless of age.
• People with sick sinus syndrome who have symptoms.
• People with certain forms of heart failure whose heart muscle is not contracting in a coordinated way.
• Selected patients with congenital heart disease or after cardiac surgery.
• People with neurally mediated fainting in specific, carefully selected situations.

Before deciding on a pacemaker, your cardiologist will usually want to confirm that the rhythm problem is genuinely the cause of your symptoms, and that reversible causes — such as a medication slowing the heart, an electrolyte imbalance, or an underactive thyroid — have been ruled out or addressed. If a medication can be safely stopped or changed and that fixes the rhythm, a pacemaker may not be needed.

Types of Pacemakers

Four pacemaker types compared: ① single-chamber (one lead to right ventricle), ② dual-chamber (leads to right atrium and right ventricle), ③ biventricular/CRT (three leads), ④ leadless capsule inside the right ventricle.

*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.

Single-chamber pacemaker

A single-chamber pacemaker uses one lead, usually placed in the right ventricle (the lower right chamber) or, less commonly, the right atrium. It is typically used when only one chamber needs pacing — for example, in some people with atrial fibrillation who also have a slow heart rate.

Dual-chamber pacemaker

A dual-chamber pacemaker uses two leads — one in the right atrium and one in the right ventricle. It can coordinate the timing between the upper and lower chambers, which is closer to how the heart naturally works. Doctors commonly choose this type for people with AV block or sick sinus syndrome who are otherwise in normal sinus rhythm, because it allows the atrium and ventricle to beat in proper sequence.

Biventricular pacemaker (Cardiac Resynchronisation Therapy, CRT)

A biventricular pacemaker uses three leads — one in the right atrium, one in the right ventricle, and one that paces the left ventricle through a vein on the heart’s surface. It is used in selected people with heart failure whose left and right ventricles do not contract in a coordinated way (often shown by a pattern called left bundle branch block on the ECG). By making the two ventricles squeeze together, CRT can improve pumping efficiency and symptoms.

Leadless pacemaker

A leadless pacemaker is a small, capsule-sized device that is implanted directly inside the right ventricle through a vein in the groin. It does not need a chest incision or leads running through veins. Leadless devices are an option for selected patients, particularly those at higher risk of infection or those without good access through the veins under the collarbone. They currently pace only one chamber, although newer dual-chamber leadless systems are emerging.

Rate-responsive pacemakers

Most modern pacemakers, whether single- or dual-chamber, include a rate-response feature. A built-in sensor detects body movement or breathing rate and speeds up the pacing during exercise, then slows it down at rest — mimicking how a healthy heart naturally adapts.

Implantable cardioverter-defibrillators (ICDs) and combination devices

An ICD is a related but different device that treats dangerously fast heart rhythms by delivering a shock. Some patients need a combined device that both paces a slow rhythm and treats a dangerous fast rhythm (for example, a CRT-D, which combines resynchronisation therapy with defibrillator function). Whether you need a simple pacemaker or a combination device is a clinical decision based on your specific heart condition.

Alternatives and What to Consider First

Before recommending a permanent pacemaker, doctors look for and address reversible causes of slow rhythms. These can include:

• Medication review. Beta-blockers, certain calcium channel blockers, digoxin, and some other drugs can slow the heart. Stopping or adjusting these may resolve the problem.
• Treating underlying conditions. An underactive thyroid, electrolyte disturbances, sleep apnea, or Lyme disease can affect the heart’s rhythm and may be treatable.
• Treating ischemia or a recent heart attack. Sometimes rhythm problems after a heart attack improve once blood flow is restored.

In some short-term situations, a temporary pacemaker may be used — for example, after cardiac surgery or during a serious infection — while doctors wait to see whether the rhythm recovers.

For specific situations such as vasovagal fainting in younger people, lifestyle measures and education are often tried first, with a pacemaker considered only when episodes are frequent, dangerous, or have a clear cardiac-pause pattern.

If the rhythm problem is fixed and symptomatic, however, no medication can replace what a pacemaker does. In that situation, major societies describe pacemaker implantation as the standard treatment.

Preparing for Pacemaker Implantation

Preparation is straightforward for most people. Your team will explain the steps in detail and answer your questions before the day of the procedure.

Tests and assessments

You can expect:

• An ECG and, in many cases, a 24- or 48-hour Holter monitor or other ambulatory rhythm recording.
• An echocardiogram (ultrasound of the heart) to assess pumping function and structure.
• Blood tests, including kidney function, blood count, and clotting studies.
• A chest X-ray.
• A review of your full medical history and current medications.

Medication adjustments

Blood thinners and anti-platelet medications need careful planning. Some may be paused before the procedure; others may be continued, depending on the drug and your individual risk. Do not stop or change any prescribed medication on your own. Your cardiologist will give specific instructions.

If you have diabetes, your team will guide you on how to adjust insulin or oral medication around the period of fasting.

The day before and the day of the procedure

• You will usually be asked to fast for 6 to 8 hours before the procedure.
• Shower with regular soap; some hospitals provide an antiseptic wash.
• Leave jewellery, watches, and valuables at home.
• Wear or bring loose, comfortable clothing that opens at the front for the trip home.
• You will sign an informed consent form after a discussion of the benefits, risks, and alternatives.

Most patients are admitted to hospital either the night before or the morning of the procedure.

What Happens During Pacemaker Implantation

The procedure is performed in a specialised room called a cardiac catheterisation laboratory (cath lab) or an electrophysiology lab. The team usually includes a cardiologist or electrophysiologist (a cardiologist with extra training in heart rhythm problems), a nurse, a technician, and sometimes an anaesthesia provider.

Anaesthesia

Most pacemaker implantations are done under local anaesthesia with light sedation. You are awake but relaxed and drowsy, and you do not feel pain at the incision site. General anaesthesia is occasionally used in specific situations, such as for children or for very anxious patients.

Step-by-step

1. Preparation. You lie on your back. The skin below the collarbone (usually on the left side for right-handed people, and the right side for left-handed people) is cleaned and draped. An IV line is placed, and your heart rhythm, blood pressure, and oxygen levels are monitored throughout.
2. Local anaesthetic. The skin is numbed with an injection. You may feel a brief sting, then pressure but no sharp pain.
3. Vein access. A small incision — usually 4 to 6 cm — is made just below the collarbone. The doctor accesses a large vein (commonly the subclavian or axillary vein) that leads back to the heart.
4. Lead placement. One to three thin leads are threaded through the vein and guided to the correct chambers of the heart using continuous live X-ray (fluoroscopy). The lead tips are fixed to the inner heart wall.
5. Testing. The leads are connected to a testing device to confirm they are sensing the heart’s signals correctly and that pacing impulses are reaching the heart muscle.
6. Generator placement. A small pocket is created under the skin (and sometimes under the chest muscle), the leads are connected to the pulse generator, and the generator is tucked into place.
7. Closing. The incision is closed with absorbable stitches under the skin. A simple dressing is applied. There are usually no stitches to remove later.
8. Programming. Before you leave the lab, the device is programmed using a wireless wand placed over the chest. Settings such as the lower heart rate, response to exercise, and chamber timing are tailored to you.

The procedure typically takes 60 to 120 minutes. A leadless pacemaker is implanted differently — through a catheter in the groin vein — and the device is placed directly inside the right ventricle without any chest incision.

What it feels like

Most people describe pressure or pulling near the collarbone but no pain inside the chest or the heart itself. You may hear the team talking and see screens around you. Sedation helps most people feel calm and sometimes sleepy.

Recovery and Healing

Recovery after pacemaker implantation is generally smooth and follows a predictable pattern.

In hospital

• You will rest in bed for several hours after the procedure.
• The team will check the wound, your vital signs, and the pacemaker function.
• A chest X-ray confirms that the leads are correctly positioned and that there is no air around the lung (pneumothorax).
• The pacemaker is interrogated — checked wirelessly — to confirm it is working as intended.
• Most people are discharged the same day or the next day.

The first few weeks at home

Common guidance during early recovery includes:

• Arm movement. Avoid raising the arm on the side of the device above shoulder level for the first 2 to 4 weeks. Avoid sudden, sweeping movements such as overhead throws, lifting heavy objects, or strenuous pushing or pulling.
• Wound care. Keep the dressing dry until your team says it is safe to remove. Do not soak the wound in baths, swimming pools, or hot tubs until it has fully healed. Showering is usually allowed after the first day or two, depending on the dressing.
• Activity. Light walking is usually encouraged from the day after the procedure. Most people return to desk work within a few days to a week. Avoid driving until your doctor confirms it is safe — this can vary depending on your symptoms before the procedure and local guidance.
• Discomfort. Mild soreness, bruising, and a feeling of fullness near the device are normal. Simple pain relief such as paracetamol is usually sufficient.

Signs to report

Contact your team if you notice:

• Increasing redness, swelling, warmth, or discharge at the wound site.
• Fever.
• Worsening chest pain or breathlessness.
• Dizziness, fainting, or a feeling that the heart is racing or pausing.
• Persistent hiccups or twitching of muscles near the device, which can sometimes indicate a lead issue.

Longer-term healing

Pacemaker recovery timeline: ① day 1 – rest, wound check, chest X-ray; ② days 2–7 – light walking, showering permitted; ③ weeks 1–4 – arm restriction, return to desk work; ④ weeks 4–6 – gradual activity increase, driving review; ⑤ week 6–8 – return to full activities.

Remote pacemaker monitoring: a patient at home with a bedside transmitter sending heart rhythm data wirelessly to their cardiology clinic.

*AI-generated image - for illustration only. Clinical accuracy is not guaranteed.

Pacemaker implantation is considered one of the safer cardiac procedures, and serious complications are uncommon. Still, it is a procedure that opens skin, places hardware through veins, and involves the heart, so risks exist. Knowing them helps you recognise problems early.

Possible complications include:

• Bleeding or bruising at the pocket site. A larger collection of blood (haematoma) occasionally needs draining.
• Infection of the pocket or, less commonly, the leads. Pocket infection rates are generally low but increase with repeat procedures and certain risk factors. A serious infection involving the leads usually requires removal of the device.
• Pneumothorax — air leaking around the lung — can occur when the vein under the collarbone is accessed. Most cases are small and resolve on their own; occasionally a chest tube is needed.
• Lead displacement — the lead tip can move from its position, particularly in the first weeks. This may require a small repeat procedure to reposition it.
• Vein thrombosis — clot in the vein where the leads sit. This can cause arm swelling and is treated with blood thinners.
• Cardiac perforation or tamponade — a rare but serious complication in which the lead pierces the heart wall, allowing blood to collect around the heart.
• Device-related issues over time — lead fracture, insulation damage, or generator malfunction. Modern devices and leads are designed for long-term reliability, but problems can develop years later.
• Twiddler’s syndrome — an uncommon situation in which the device rotates within its pocket and pulls on the leads. It is more often seen in patients who unconsciously play with the device under the skin.

For most people, the pacemaker becomes a quiet background presence rather than something they notice day to day. The conditions that prompted the procedure — fatigue, light-headedness, fainting, or breathlessness — often improve quickly.

Follow-up and device checks

Your pacemaker will be checked regularly. A typical schedule includes:

• An in-person check around 4 to 6 weeks after implantation.
• Periodic checks every 3 to 12 months, depending on the device and your needs.
• Increasing frequency of checks as the battery approaches its end.

Many modern pacemakers support remote monitoring: the device sends data through a small home transmitter or a smartphone app to your clinic, reducing the number of in-person visits and allowing earlier detection of problems.

Battery life and generator change

Pacemaker batteries typically last 8 to 12 years, depending on how often the device paces and the type of device. When the battery runs low, the generator is replaced in a shorter procedure that uses the existing leads. Leads are usually left in place and can serve more than one generator.

Daily activities

Most people return to a full life: walking, sports, swimming, gardening, travel, and work. A few practical points:

• Mobile phones are safe to use. As a general precaution, hold the phone to the ear on the opposite side of the device.
• Airport security is generally safe. Carry your pacemaker identification card and let security staff know — they will usually hand-search rather than use the metal detector for long periods.
• Strong electromagnetic fields — such as arc welding equipment, large industrial motors, or certain power tools used very close to the chest — can interfere with pacemakers. Most household appliances, including microwaves, are safe.
• MRI scans are no longer automatically ruled out. Many modern pacemakers are “MRI-conditional”, meaning they can be scanned safely under specific conditions. Always tell any healthcare provider, including dentists, that you have a pacemaker before any imaging or procedure.
• Medical procedures. Some surgical equipment (such as electrocautery) and certain treatments (such as radiation therapy or lithotripsy) require the pacemaker to be checked or temporarily adjusted.

Driving

Driving rules after pacemaker implantation vary by country and depend on the original symptoms. Many patients can resume non-commercial driving within a short period after the procedure once their team confirms it is safe. Commercial driving may have stricter rules.

Emotional and psychological adjustment

Some people feel anxious in the first weeks after a pacemaker is implanted — aware of the device under the skin, unsure what activities are safe, or simply adjusting to the idea of relying on technology to support the heart. These feelings usually settle. Talking with your care team, joining a patient support community, or speaking with a counsellor if anxiety persists are all reasonable steps.

Pacemakers in Children

Children may need pacemakers for different reasons than adults — most often for congenital heart block, complications after surgery for congenital heart disease, or genetic conditions affecting the heart’s electrical system.

Key differences in the paediatric setting include:

• Implantation approach. In very young children, the leads may be attached to the outside of the heart through a small chest surgery rather than threaded through veins, because the veins are too small.
• Growth. Leads need to allow for the child’s growth. The device may need adjustment or replacement as the child grows.
• Battery and lead longevity. Because children live with the device for decades, generator changes and possible lead replacements are an expected part of long-term care.
• Activity guidance. Most children with pacemakers can take part in school, sport, and play with sensible precautions. High-impact contact sports are usually discussed individually.
• Family support. Paediatric cardiology teams work closely with parents on monitoring, school communication, and helping children understand their device.

Paediatric pacemaker care is highly specialised and is usually based in centres with congenital heart disease expertise.

Frequently Asked Questions

Will I feel the pacemaker working?

Most people do not feel the pacemaker firing. The impulses are very small and are timed to match the heart’s own rhythm. Some people are aware of a small bump under the skin, especially if they are thin, but the device itself is silent.

How long does a pacemaker last?

Pacemaker batteries typically last between 8 and 12 years. The exact lifespan depends on how often the device needs to pace. Leads can often last much longer and may be reused with a new generator.

Can I exercise with a pacemaker?

Yes, most people can. Modern pacemakers have rate-response sensors that increase the pacing rate during exercise. Walking, cycling, swimming, and most recreational sports are generally fine once you have healed. Contact sports and activities involving strong direct impact to the chest are usually discussed with your team.

Can I have an MRI scan?

Many modern pacemakers are MRI-conditional and can be scanned safely under specific conditions. Older devices may not be safe in an MRI scanner. Always inform the radiology team about your pacemaker, and bring your device card so they can confirm what is safe.

Will the pacemaker set off airport security?

The pacemaker may set off some metal detectors. Show your pacemaker identification card to security staff, who will typically use a hand search. Prolonged exposure to handheld metal detectors near the device is generally avoided.

Can I use a mobile phone?

Yes. Mobile phones are safe with pacemakers. As a sensible precaution, hold the phone to the ear on the opposite side of the device and avoid keeping the phone in a shirt pocket directly over the pacemaker.

What happens when the battery runs out?

The battery does not stop suddenly. Regular checks detect when it is approaching the end of its life, usually months in advance. The pulse generator is then replaced in a shorter procedure, and the existing leads are typically reused.

Can a pacemaker be removed if it is no longer needed?

In most adults, the underlying conduction problem does not reverse, and the pacemaker remains in place lifelong. In selected situations — for example, when the cause of the rhythm problem turns out to be reversible — the device may eventually be switched off or removed. Lead removal is a specialised procedure and is not done routinely.

Is there anything I should always carry?

Yes. After implantation, you will receive a pacemaker identification card that lists the type of device, the leads, and the implant date. Carry this card at all times. It is useful at airports, in hospitals, and in any emergency.

Conclusion

Pacemaker implantation is a well-established procedure for slow or unreliable heart rhythms. For people whose symptoms come from a rhythm problem the heart cannot fix on its own, a pacemaker addresses the underlying electrical issue rather than just masking symptoms, and the procedure itself is comparatively short with a predictable recovery.

If you have been advised to consider a pacemaker, the most useful next step is a detailed conversation with your cardiologist or electrophysiologist about the specific rhythm problem you have, the type of device that fits your situation, what the procedure and recovery will involve for you personally, and what long-term follow-up will look like. Understanding the device and the plan ahead of time tends to make the experience far less daunting.