Beatrice Lang
Pacemakers are inserted when the electrical control system of the heart is damaged and unable to function properly. This procedure involves the implantation of a small electronic device in the chest, just below the collarbone, to regulate slow electrical problems with the heart. Modern pacemakers are programmed to work on demand and do not compete with natural heartbeats. They are designed to send electrical impulses to the heart only when its natural rate falls below the pacemaker's lower limit.
| Characteristics | Values |
|---|---|
| Inserted device | Pacemaker |
| Reason for insertion | When the electrical-control system of the heart is so damaged that it cannot function properly |
| Location of insertion | Usually placed in the chest (just below the collarbone) |
| Function | To help regulate slow electrical problems with the heart |
| Working | Programmed to work on demand only; no electrical impulses will be sent to the heart unless the heart's natural rate falls below the pacemaker's lower limit |
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What You'll Learn
- Pacemakers are inserted when the heart's electrical control system is damaged
- Biventricular pacemakers are used to treat specific types of heart failure
- Pacemakers may be recommended to treat bradycardia
- Implantable cardioverter defibrillators (ICDs) are used to treat severe heart failure
- Valve replacement is a surgical procedure used to treat heart failure
Pacemakers are inserted when the heart's electrical control system is damaged
The heart has its own electrical system, which tells the heart's chambers when to contract and pump blood to the body. When the heart's electrical system is damaged, the chambers may contract in the wrong order or too weakly to provide enough blood to the body. This can lead to cardiac arrest, a state in which the heart fails to generate effective and detectable blood flow.
Pacemakers are inserted when the heart's electrical control system is so damaged that it cannot function properly. They are small electronic devices that are usually placed in the chest, just below the collarbone, to help regulate slow electrical problems with the heart. The heart is basically a pump made up of muscle tissue that is stimulated by electrical currents, which normally follow a specific circuit within the heart.
The normal electrical circuit begins in the sinus or sinoatrial (SA) node, a small mass of specialized tissue located in the right atrium (upper chamber) of the heart. The SA node generates an electrical stimulus at 60 to 100 times per minute (for adults) under normal conditions. This electrical impulse from the SA node starts the heartbeat. The electrical impulse travels from the SA node via the atria to the atrioventricular (AV) node in the bottom of the right atrium. From there, the impulse continues down an electrical conduction pathway called the Bundle of His and then on through the "His-Purkinje" system into the ventricles (lower chambers) of the heart.
Pacemakers use electrical impulses to correct these kinds of malfunctions and can stabilize abnormal heart rhythms. They are composed of three parts: a pulse generator, one or more leads, and an electrode on each lead. A pacemaker signals the heart to beat when the heartbeat is too slow or irregular.
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Biventricular pacemakers are used to treat specific types of heart failure
A pacemaker is inserted when the electrical control system of the heart is damaged and cannot function properly. Biventricular pacemakers are a type of pacemaker used to treat specific types of heart failure.
In a healthy heart, electrical signals help the left and right lower chambers (ventricles) pump together. With heart failure, abnormal signals cause ventricle contractions to fall out of sync. This leads to a decrease in the number of effective contractions and, therefore, the amount of oxygen-rich blood pumped out to the body. This can cause symptoms such as shortness of breath, dry cough, swelling in the ankles or legs, weight gain, increased urination, fatigue, or rapid or irregular heartbeat.
Biventricular pacemakers help the heart work more efficiently by generating painless electrical impulses that pass through leads to the heart's chambers, helping them pump together. This treatment is also known as cardiac resynchronization therapy (CRT). Candidates for a biventricular pacemaker are typically on heart failure medications but continue to experience worsening symptoms.
Biventricular pacemakers improve symptoms of heart failure in about 50% of people who receive the device. They can lead to a better quality of life, fewer heart-related hospitalizations, improved heart functioning, and longer survival. However, as with any heart failure treatment, there is a risk of complications, such as cardiac tamponade, collapsed lung, lead dislodgement, mechanical failure, and nerve damage.
To be eligible for a biventricular pacemaker, patients must have severe or moderately severe heart failure symptoms and LV/RV synchrony problems. The procedure to implant the device is minor but requires a small incision in the chest, and there are two techniques for placing the wire leads: the endocardial (transvenous) approach and the epicardial approach. Following the procedure, patients should limit activity on the side of the pacemaker for 4-6 weeks to prevent the leads from moving out of position.
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Pacemakers may be recommended to treat bradycardia
The heart has its own electrical system, which tells the heart chambers when to contract. When the heart's electrical system malfunctions, pacemakers can be used to correct these kinds of malfunctions with electrical impulses.
Pacemakers are small devices implanted under the skin of the chest to support the electrical system in the heart. They can be used to treat bradycardia, also known as a slow heartbeat, by helping to restore the heart's rhythm. The pacemaker continuously monitors the heart and sends out small electrical signals to correct it if it detects a slow heart rate.
There are different types of pacemakers, including single-chamber, dual-chamber, and biventricular pacemakers. The type of pacemaker needed depends on the specific heart problem. Single-chamber pacemakers use one wire attached to one chamber of the heart, dual-chamber pacemakers use two wires attached to two chambers, and biventricular pacemakers use three wires, two of which attach to the ventricles and one to the right atrium.
Pacemakers with leads are recommended for people whose hearts need pacing in the right ventricle or both the right atrium and ventricle. The leads are thin, flexible, insulated wires that carry the electrical impulse from the pacemaker to the heart and relay information about the heart's natural activity back to the pacemaker.
Leadless pacemakers, on the other hand, are placed directly inside the heart and do not require wires. They are attached to the inner wall of the heart and are about the size of a large vitamin.
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Implantable cardioverter defibrillators (ICDs) are used to treat severe heart failure
Implantable cardioverter defibrillators (ICDs) are small electronic devices connected to the heart to monitor and control fast and sometimes life-threatening electrical problems. They are inserted when the heart's electrical control system is so damaged that it cannot function properly. ICDs are useful in preventing sudden death for those with life-threatening arrhythmia or those who have survived sudden cardiac arrest.
The device is about the size of a stopwatch and is implanted under the skin, usually just below the collarbone. It can also be implanted several inches below the armpit. The ICD has a battery-powered pulse generator, with a battery and a tiny computer, and wires (leads) that run to specific places on the heart's surface or inside the heart. The wires can be installed through blood vessels, eliminating the need for open-chest surgery.
The ICD detects abnormal heartbeats and attempts to restore a normal heartbeat. When a heartbeat is too slow, the ICD can act as a pacemaker, sending tiny electric signals to the heart. When the heartbeat is too fast or chaotic, the ICD delivers defibrillation shocks to stop the abnormal rhythm. These shocks have been described as feeling like a "kick in the chest".
ICDs work 24 hours a day and provide continuous monitoring and treatment for those at risk of severe heart failure. They can be implanted as an outpatient procedure or during a hospital stay, depending on the patient's condition and the healthcare provider's practices.
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Valve replacement is a surgical procedure used to treat heart failure
When the electrical control system of the heart is severely damaged, pacemakers are inserted to help the heart function properly.
Heart valve replacement is a surgical procedure used to treat heart failure. The procedure involves repairing or replacing diseased heart valves. Traditionally, this is done through open-heart surgery, where a large incision is made in the chest, and the heart is temporarily stopped to allow the surgeon to repair or replace the valve. However, newer, less invasive techniques have been developed, which involve smaller incisions, reducing post-operative pain and hospital stay duration.
During the procedure, the patient is positioned on their back on the operating table. An intravenous (IV) line is placed in the arm or hand for medication administration and IV fluids. Additional catheters may be inserted into the blood vessels in the neck and wrist to monitor vital signs, such as heart rate and blood pressure, and to collect blood samples. The patient is sedated, and a breathing tube is inserted into their lungs. A transesophageal echocardiogram (TEE) probe is placed into the esophagus to monitor valve function, and a Foley catheter is inserted into the bladder to drain urine.
If open-heart surgery is performed, a vertical incision is made down the center of the chest, and the sternum (breastbone) is cut lengthwise and separated to expose the heart. The diseased valve may be repaired using a ring to support it or replaced entirely with an artificial valve. After the procedure, it is crucial to keep the surgical area clean and dry, and patients should follow specific bathing instructions provided by their healthcare provider. Activity restrictions, such as refraining from driving, may also be advised.
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Frequently asked questions
Pacemakers.
A pacemaker is a small electronic device implanted in the chest to regulate slow electrical problems with the heart.
Modern pacemakers are programmed to work on demand only. They send electrical impulses to the heart when its natural rate falls below the pacemaker's lower limit.
Some examples include bradycardia, tachy-brady syndrome, and heart block.
It is important to inform your surgeon about your pacemaker before the operation. You should also consult your cardiologist for advice on any special precautions that may be necessary during the surgery.
