Pacemaker - Mayo Clinic
Pacemaker - Mayo Clinic
Pacemaker - Mayo Clinic
Pacemaker
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Overview
A pacemaker is a small device that's placed (implanted) in the chest to help
control the heartbeat. It's used to prevent the heart from beating too slowly.
Implanting a pacemaker in the chest requires a surgical procedure.
Types
Depending on your condition, you might have one of the following types of
pacemakers.
Types
Cardiac resynchronization therapy
The heart is a muscular, fist-sized pump with four chambers, two on the left side
and two on the right. The upper chambers (right and left atria) and the lower
chambers (right and left ventricles) work with your heart's electrical system to
keep your heart beating at an appropriate rate — usually 60 to 100 beats a
minute for adults at rest.
Pacemaker
Enlarge image
Pacemakers work only when needed. If your heartbeat is too slow (bradycardia),
the pacemaker sends electrical signals to your heart to correct the beat.
Some newer pacemakers also have sensors that detect body motion or
breathing rate and signal the devices to increase heart rate during exercise, as
needed.
Pulse generator. This small metal container houses a battery and the
electrical circuitry that controls the rate of electrical pulses sent to the
heart.
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Leads (electrodes). One to three flexible, insulated wires are each placed in
one or more chambers of the heart and deliver the electrical pulses to
adjust the heart rate. However, some newer pacemakers don't require leads.
These devices, called leadless pacemakers, are implanted directly into the
heart muscle.
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Risks
Complications related to pacemaker surgery or having a pacemaker are
uncommon, but could include:
Infection near the site in the heart where the device is implanted
Swelling, bruising or bleeding at the pacemaker site, especially if you take
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blood thinners
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Blood clots (thromboembolism) near the pacemaker site
Damage to blood vessels or nerves near the pacemaker
Collapsed lung (pneumothorax)
Blood in the space between the lung and chest wall (hemothorax)
Movement (shifting) of the device or leads, which could lead to cardiac
perforation (rare)
Electrocardiogram (ECG or EKG). This quick and painless test measures the
electrical activity of the heart. Sticky patches (electrodes) are placed on the
chest and sometimes the arms and legs. Wires connect the electrodes to a
computer, which displays the test results. An ECG can show if the heart is
beating too fast, too slow or not at all.
Holter monitoring. A Holter monitor is a small, wearable device that keeps
track of the heart's rhythm. Your doctor may want you to wear a Holter
monitor for 1 to 2 days. During that time, the device records all of your
heartbeats. Holter monitoring is especially useful in diagnosing heartbeat
problems that occur at unpredictable times. Some personal devices, such as
smartwatches, offer electrocardiogram monitoring. Ask your doctor if this is
an option for you.
Echocardiogram. This noninvasive test uses sound waves to produce
images of the heart's size, structure and motion.
Stress test. Some heart problems occur only during exercise. For a stress
test, an electrocardiogram is taken before and immediately after walking on
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a treadmill or riding a stationary bike. Sometimes, a stress test is done along
with echocardiography or nuclear imaging.
You'll likely be awake during the surgery to implant the pacemaker, which
typically takes a few hours. A specialist will insert an IV into your forearm or
hand and give you a medication called a sedative to help you relax. Your chest is
cleaned with special soap.
Most pacemaker implantations are done using local anesthesia to numb the
area of the incisions. However, the amount of sedation needed for the
procedure depends on your specific health conditions. You may be fully awake
or lightly sedated, or you may be given general anesthesia (fully asleep).
One or more wires are inserted into a major vein under or near your collarbone
and guided to your heart using X-ray images. One end of each wire is secured at
the appropriate position in your heart, while the other end is attached to the
pulse generator, which is usually implanted under the skin beneath your
collarbone.
Your doctor might recommend that you avoid vigorous exercise or heavy lifting
for about a month. Avoid putting pressure on the area where the pacemaker was
implanted. If you have pain in that area, ask your doctor about taking medicines
available without a prescription, such as acetaminophen (Tylenol, others) or
ibuprofen (Advil, Motrin IB, others).
Special precautions
It's unlikely that your pacemaker would stop working properly because of
electrical interference. Still, you'll need to take a few precautions:
Cellphones. It's safe to talk on a cellphone, but keep your cellphone at least
6 inches (15 centimeters) away from your pacemaker. Don't keep your
phone in a shirt pocket. When talking on your phone, hold it to the ear
opposite the side where your pacemaker was implanted.
Security systems. Passing through an airport metal detector won't interfere
with your pacemaker, although the metal in the pacemaker could sound the
alarm. But avoid lingering near or leaning against a metal-detection system.
To avoid potential problems, carry an ID card stating that you have a
pacemaker.
Medical equipment. Make sure all your doctors and dentists know you have
a pacemaker. Certain medical procedures, such as magnetic resonance
imaging, CT scans, cancer radiation treatment, electrocautery to control
bleeding during surgery, and shock wave lithotripsy to break up large kidney
stones or gallstones could interfere with your pacemaker.
Power-generating equipment. Stand at least 2 feet (61 centimeters) from
welding equipment, high-voltage transformers or motor-generator systems.
If you work around such equipment, ask your doctor about arranging a test
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in your workplace to determine whether the equipment affects your
pacemaker.
Devices that are unlikely to interfere with your pacemaker include microwave
ovens, televisions and remote controls, radios, toasters, electric blankets,
electric shavers, and electric drills.
Results
Having a pacemaker should improve symptoms caused by a slow heartbeat
such as fatigue, lightheadedness and fainting. Because most of today's
pacemakers automatically adjust the heart rate to match the level of physical
activity, they may can allow you to resume a more active lifestyle.
Your doctor should check your pacemaker every 3 to 6 months. Tell your doctor
if you gain weight, if your legs or ankles get puffy, or if you faint or get dizzy.
Most pacemakers can be checked by your doctor remotely, which means you
don't have to go into the doctor's office. Your pacemaker sends information to
your doctor, including your heart rate and rhythm, how your pacemaker is
working, and how much battery life is left.
Your pacemaker's battery should last 5 to 15 years. When the battery stops
working, you'll need surgery to replace it. The procedure to change your
pacemaker's battery is often quicker and requires less recovery time than the
procedure to implant your pacemaker.
Clinical trials
Explore Mayo Clinic studies of tests and procedures to help prevent, detect,
treat or manage conditions.
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Related
Atrial flutter
Bradycardia
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