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A pacemaker is a small battery-powered device that sends weak electrical impulses to "set a pace" so that the heart is able to keep a regular heartbeat.
There are different types of pacemakers, so your doctor will work with you to decide what kind will be best for you.
- Single-chamber pacemakers stimulate one chamber of the heart, either an upper chamber (atrium) or, more commonly, a lower one (ventricle).
- Dual-chamber pacemakers send electrical impulses to both the atrium and the ventricle and pace both chambers. A dual-chamber pacemaker synchronizes the rhythm of the atrium and ventricles in a pattern that closely resembles the natural heartbeat. Dual-chamber pacemakers are often used to treat a slow heart rate.
- Biventricular pacemakers pace the rhythm of the heart's lower chambers (ventricles) so that the chambers contract at the same time. Biventricular pacemakers are used in people who have heart failure and problems with the heart's electrical system. Biventricular pacemakers are also called cardiac resynchronization therapy (CRT).
Most new pacemakers are rate-responsive, or physiologic, pacemakers. This type of pacemaker varies its rate to cause the heart to beat faster when you are exercising to meet your body's increased needs or slower when you are at rest. Another type, the fixed-rate pacemaker, sends electrical impulses at a set rate that does not vary either faster or slower. Both types of pacemakers send electrical impulses when the heart rate drops to a predetermined "slow" level.
Some pacemakers are a combination of a pacemaker with an implantable cardioverter-defibrillator (ICD). This combination pacemaker and ICD is used for people who need a pacemaker and also have a risk for abnormal heart rhythms.
How pacemakers are placed
Permanent pacemakers are surgically implanted into the chest.
The procedure to implant a pacemaker is considered minor surgery. It can usually be done using local anesthesia . Your doctor will make a small incision in your chest wall just below your collarbone. He or she then usually threads the pacemaker wires (leads) through the incision into a large blood vessel in the upper chest and into the heart. Your doctor uses X-rays to place the leads in the heart. Using the same incision, your doctor creates a small pocket under the skin to hold the pacemaker. He or she then attaches the leads to the pacemaker. The procedure takes about an hour.
Temporary pacemakers are located outside the body and attached to the heart by a wire threaded through a neck vein or leg vein or through the chest wall. Temporary pacemakers are most commonly used for a short time following heart surgery or in emergency situations.
What To Expect After Treatment
Most people stay overnight in the hospital after having a pacemaker implanted and typically go home the next day. But sometimes, the surgery is done as an outpatient procedure, which means you do not need to stay overnight in the hospital.
Most people return to normal activities after a few weeks. For several weeks after having a pacemaker implanted, you should avoid vigorous physical activity that involves the upper body.
Some activities and situations can interrupt the signals sent by the pacemaker to the heart. You may need to adapt some of your activities. Follow your doctor's specific instructions about care and precautions if you have a pacemaker.
Once or twice a year your doctor will check your pacemaker and adjust it, if needed. footnote 1 In between checkups at your doctor's office, you will probably send information from your pacemaker to your doctor. You will do this by using a telephone or the Internet.
Permanent pacemakers are powered by batteries. The batteries usually last 5 to 15 years before they need to be replaced.
Why It Is Done
Your doctor might recommend that you get a pacemaker if:
- You have a problem with your heart rhythm that could be helped by a pacemaker.
- You have trouble doing everyday activities, or you can't do them at all.
- You have health problems that increase your chances of having heartbeat problems.
How Well It Works
Pacemakers stimulate the heart to speed up when it beats too slowly. They can also substitute for the natural pacemaker of the heart ( SA node ) or the heart tissue that regulates the beating of the ventricles (AV node).
Pacemakers allow people to return to normal, active lives. Most people have very few limitations, if any.
There are several risks to getting a pacemaker. But risks vary for each person. The chance of most problems is low.
The procedure to implant a pacemaker is safe and most people do well afterward. Afterward, you will see your doctor regularly to check your pacemaker and make sure you don't have any problems.
During the procedure
If problems happen during the procedure, doctors can likely fix them right away.
- A lung could collapse (pneumothorax). This happens if air builds up in the space between the lung and the chest wall. But a pneumothorax can be treated and people recover well. This problem may happen about 1 to 5 times out of a 100. footnote 2
- Serious problems during the procedure are very rare. These problems include heart attack, stroke, or the need for an emergency surgery. They might happen 1 time out of 1,000. footnote 3
After the procedure
Problems after the procedure can be minor, like mild pain, or serious, like an infection. But your doctor can solve most of these problems. And most people do not have long-term issues with their pacemakers.
- Pain, bleeding, or bruising soon after the procedure.
- Blood clots in your arms, which cause a lot of swelling.
- Infection in your chest near the pacemaker. An infection might happen about 1 time out of 100. This means that about 99 times out of 100 there is no infection. footnote 4
- Device problems that need another procedure to fix them. This might happen if a pacemaker lead breaks or a lead moves out of place. A lead might move out of place about 1 time out of 100. footnote 5
What To Think About
In rare cases, people feel throbbing in the neck, chest fullness, or lightheadedness when the pacemaker sends out impulses. Talk to your doctor about what types of side effects you may expect from your pacemaker.
In rare cases, pacemakers are recalled by the maker of the pacemaker. A recall means that the pacemaker has a problem that needs to be watched closely or fixed.
- Epstein AE, et al. (2013). 2012 ACCF/AHA/HRS focused update incorporated into the ACCF/AHA/HRS 2008 guidelines for device-based therapy of cardiac rhythm abnormalities. Circulation, 127(3): e283–e352.
- Res JCJ, et al. (2004). Pneumothorax resulting from subclavian puncture: a complication of permanent pacemaker lead implantation. Netherlands Heart Journal, 12(3): 101–105.
- Akoum NW, et al. (2008). Pacemaker therapy. In EG Nabel, ed., ACP Medicine, section 1, chap. 7. Hamilton, ON: BC Decker.
- Baddour LM, et al. (2010). Update on cardiovascular implantable electronic device infections and their management. A scientific statement from the American Heart Association. Circulation, 121(3): 458–477.
- Swerdlow CD, et al. (2012). Pacemakers and implantable cardioverter-defibrillators. In RO Bonow et al., eds., Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 9th ed., vol. 1, pp. 745–770. Philadelphia: Saunders.
Current as of: February 20, 2015