PACEMAKER

A pacemaker is a tiny device that is implanted in the chest to assist with heartbeat regulation. It serves as a safeguard against the heart beating too slowly. The placement of a pacemaker in the chest necessitates surgery.

 

Another name for a pacemaker is a cardiac pacing device.

Types

You could have one of the following pacemaker kinds, depending on your health.

 

SINGLE CHAMBER PACEMAKER:  This kind often delivers electrical impulses to your heart's right ventricle.

 

DUAL CHAMBER PACEMAKER:  To assist regulate the timing of contractions between the two chambers of your heart, this kind sends electrical impulses to the right ventricle and right atrium.

 

BIVENTRICULAR PACEMAKER: Cardiovascular resynchronization treatment, commonly known as biventricular pacing, is used to treat patients with heart failure and irregular heartbeats. This kind of pacemaker stimulates the right and left ventricles, the lower heart chambers, to increase the heart's efficiency.

Why it is done?

In order to assist regulate your heartbeat, a pacemaker is installed. If your heartbeat is sluggish (bradycardia) after a heart attack, surgery, or drug overdose but is otherwise anticipated to improve, your doctor may advise getting a temporary pacemaker. Permanent pacemakers can be installed to treat heart failure or to fix a persistently slow or irregular pulse.

How your heart beats?

The heart has four chambers two on the left and two on the right and is a powerful, fist-sized pump. Your heart's electrical system collaborates with the right and left atria and right and left ventricles to maintain your heart pounding at the proper pace, which for people at rest is typically 60 to 100 beats per minute.

 

Your heart's electrical system, which originates in a cluster of cells at the top of the heart (the sinus node) and spreads to the bottom, regulates your heartbeat by forcing the heart to contract and pump blood. An irregular heart beat can be brought on by ageing, heart attack damage, certain drugs, and some hereditary diseases.

What a pacemaker does?

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.

 

A pacemaker has two parts:

 

Pulse generator: This small metal container houses a battery and the electrical circuitry that controls the rate of electrical pulses sent to the heart.

 

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.

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 blood thinners
  • 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)

How you prepare

Before your doctor decides if you need a pacemaker, you'll have several tests done to find the cause of your irregular heartbeat. Tests done before you get a pacemaker could include:

 

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 a treadmill or riding a stationary bike. Sometimes, a stress test is done along with echocardiography or nuclear imaging.

What you can expect

Before the procedure

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).

During the procedure

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.

 

A leadless pacemaker is smaller and typically requires a less invasive surgery to implant the device. The pulse generator and other pacemaker parts are contained in a single capsule. The doctor inserts a flexible sheath (catheter) in a vein in the groin and then guides the single component pacemaker through the catheter to the proper position in the heart.

After the procedure

You'll likely stay in the hospital for a day after having a pacemaker implanted. Your pacemaker will be programmed to fit your heart rhythm needs. You'll need to arrange to have someone drive you home from the hospital.

 

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 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.

 

Pacemakers and end-of-life issues

 

If you have a pacemaker and become terminally ill with a condition unrelated to your heart, such as cancer, it's possible that your pacemaker could prolong your life. Doctors and researchers vary in their opinions about turning off a pacemaker in end-of-life situations.

 

Talk to your doctor if you have a pacemaker and are concerned about turning it off. You may also want to talk to family members or another person designated to make medical decisions for you about what you'd like to do in end-of-life care situations.

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