A pacemaker is a small battery-powered device that sits under your skin and sends electrical signals to keep your heart beating at a steady rate

Your heart normally beats because electrical signals travel through the muscle tissue, triggering contractions. When those signals become too slow, too fast, or irregular—or when the pathways that carry them are blocked—your heart may not pump blood effectively to your brain and body. A pacemaker monitors your heart rhythm and delivers electrical pulses when needed to restore a normal pace.

The device itself is about the size of a large coin and weighs less than an ounce. It sits in a pocket created under the skin near your collarbone, with thin wires called leads running through a vein into your heart chambers. Most pacemakers last 7 to 10 years before the battery runs down and the device needs replacement.

Key Takeaways

  • A pacemaker is recommended when your heart's natural electrical system fails to maintain a safe rhythm, most commonly from heart block, sick sinus syndrome, or atrial fibrillation with a slow ventricular rate.
  • The implantation procedure takes 30 to 60 minutes and is performed under local anesthesia with sedation; you typically go home the same day or after an overnight stay.
  • Risks include infection, bleeding, collapsed lung, and lead displacement, though serious complications occur in fewer than 2 percent of procedures.
  • After implantation, you will have regular follow-up appointments to check the device's function, and you must avoid strong magnetic fields and certain medical equipment.
  • Most people return to normal activities within two to four weeks, though heavy lifting and contact sports require restrictions for several months.

When doctors recommend a pacemaker

Your cardiologist may recommend a pacemaker when tests show your heart's electrical system is not working properly. The most common reasons are heart block (where electrical signals are delayed or stopped as they travel from the upper chambers to the lower chambers), sick sinus syndrome (where the heart's natural pacemaker fires too slowly), and atrial fibrillation with a slow ventricular response (where the upper chambers beat chaotically but the lower chambers beat too slowly).

Other reasons include bradycardia (a resting heart rate below 60 beats per minute that causes dizziness or fatigue), certain medications that slow the heart rate, or recovery after heart surgery. Your doctor will use an electrocardiogram (ECG) and often a Holter monitor (a portable device you wear for 24 to 48 hours) to document the problem before recommending the procedure.

Not everyone with an irregular heartbeat needs a pacemaker. If your symptoms are mild or your heart rate drops only occasionally, your doctor may monitor you instead. The decision depends on how often the problem occurs, whether it causes symptoms like fainting or shortness of breath, and whether it puts you at risk of sudden cardiac events.

What happens before the procedure

Once your cardiologist decides a pacemaker is necessary, your primary care doctor or a pre-operative team will evaluate your overall health. You will have blood tests, an ECG, and possibly a chest X-ray. Tell your doctor about all medications you take, especially blood thinners like warfarin or apixaban—you may need to stop or adjust these before surgery.

The night before the procedure, you will be asked to fast (eat and drink nothing after midnight). Shower or bathe with soap the morning of surgery, but do not apply lotion, deodorant, or makeup. Wear loose, comfortable clothing that allows easy access to your chest. A nurse will place an IV line in your arm once you arrive at the hospital.

The procedure takes place in a cardiac catheterization lab or operating room. You will receive local anesthesia (numbing medication) at the implant site and sedation through your IV to keep you relaxed but awake. This allows your doctor to monitor your response and communicate with you during the procedure.

The implantation procedure and what to expect

Your doctor will make a small incision (usually 1.5 to 2 inches) below your collarbone, typically on the left side. The area is numbed, so you should feel pressure but not pain. If you feel sharp pain, tell your doctor immediately—they can give more anesthesia.

Next, your doctor inserts a thin wire (the lead) through a vein under your collarbone and guides it into your heart using X-ray imaging. You may feel a flutter or pounding sensation as the lead touches the heart muscle—this is normal. Once the lead is positioned correctly, your doctor tests it to make sure it senses your heartbeat and can deliver electrical signals effectively.

The pacemaker generator (the battery pack) is then connected to the lead and placed in the pocket under your skin. Your doctor closes the incision with stitches or surgical glue. The entire procedure typically takes 30 to 60 minutes. You will be moved to a recovery area where nurses monitor your heart rhythm and vital signs for several hours.

Risks and complications

Serious complications from pacemaker implantation are uncommon. Studies show that major adverse events—those requiring additional treatment or causing lasting harm—occur in fewer than 2 percent of procedures. However, you should understand what can happen.

Infection is the most common complication, occurring in about 1 to 2 percent of implants. Signs include fever, redness or warmth at the incision site, or drainage. Bleeding or hematoma (blood pooling under the skin) happens in 1 to 3 percent of cases and usually resolves on its own, though large hematomas may need drainage. Pneumothorax (a collapsed lung from an accidental puncture during lead placement) is rare but serious; it causes sudden shortness of breath and requires a chest tube.

Lead displacement occurs when the lead shifts out of position, causing the pacemaker to stop working properly. This may require a second procedure to reposition it. Perforation (the lead punctures the heart wall) is rare but can cause fluid to accumulate around the heart, requiring urgent drainage. Other less common risks include allergic reaction to the device material, blood clots, and damage to nearby nerves or blood vessels.

Your risk of complications is higher if you take blood thinners, have a bleeding disorder, are very thin, or have had previous chest surgery. Discuss your individual risk with your cardiologist before the procedure.

Recovery and restrictions in the first weeks

Most people go home the same day or after an overnight stay. Before you leave, a nurse will show you how to care for your incision: keep it clean and dry, avoid submerging it in water (showers are fine after the first few days), and watch for signs of infection.

You will wear a sling for the first week to limit movement of your arm on the side where the pacemaker was placed. Avoid lifting anything heavier than 5 pounds with that arm for the first four to six weeks. Do not reach across your body or raise your arm above shoulder height during this time, as these movements can displace the lead.

Most people can return to light activities like walking within a few days. You can usually resume driving after one week if you feel comfortable and your doctor approves. Return to work depends on your job—desk work can resume within a week or two, but jobs involving heavy lifting or strenuous activity require four to six weeks off.

You will have a follow-up appointment one to two weeks after implantation. Your doctor will check the incision, perform an ECG, and use a device called a programmer to confirm the pacemaker is working correctly and adjust settings if needed.

Living with a pacemaker long-term

Once you have recovered from surgery, a pacemaker should not significantly limit your life. You can exercise, travel, and work normally. However, you must avoid strong magnetic fields and certain medical equipment that can interfere with the device.

Do not hold a strong magnet directly over your pacemaker. This includes some refrigerator magnets, magnetic therapy devices, and industrial magnets. Metal detectors at airports and stores will not harm your pacemaker, but inform security that you have one. MRI machines can damage pacemakers, though newer devices are MRI-compatible—ask your doctor which type you have. If you need an MRI, tell the radiology department about your pacemaker; they may be able to reprogram it temporarily or use alternative imaging.

Some medical procedures require special precautions. Diathermy (deep heat therapy), electrocautery (used during surgery to stop bleeding), and certain dental procedures can interfere with pacemakers. Always tell any healthcare provider that you have a pacemaker before any procedure.

You will need regular follow-up appointments—typically every three to six months at first, then annually once the device is stable. During these visits, your doctor checks the pacemaker's battery level, lead function, and heart rhythm. As the battery weakens (usually after 7 to 10 years), you will need a replacement procedure to exchange the generator while keeping the existing leads.

Frequently Asked Questions

Can I fly with a pacemaker?

Yes. Airport security metal detectors will not damage your pacemaker. Inform security personnel that you have one, and they may use a handheld detector away from your chest or perform a pat-down instead. Carry your pacemaker identification card when you travel.

Will a pacemaker set off metal detectors?

Airport and store security metal detectors are designed to detect weapons and will not harm your device. However, they may alarm because the pacemaker contains metal. Tell security staff about your pacemaker, and they will accommodate you.

Can I exercise or play sports with a pacemaker?

Most people can exercise normally once recovered. Avoid contact sports like football or hockey for the first few months to prevent injury to the incision site. Swimming is safe once the incision is fully healed. Discuss your specific activities with your cardiologist.

What happens if my pacemaker battery dies?

Your doctor monitors battery level during regular follow-ups. When the battery weakens, you will need a replacement procedure to exchange the generator. This is a simpler surgery than the initial implantation because the leads are already in place.

Can I have an MRI with a pacemaker?

Older pacemakers are not MRI-compatible, but many newer devices are. Ask your cardiologist which type you have. If you need an MRI and your device is not compatible, your doctor may reprogram it temporarily or recommend alternative imaging like CT scan.