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Cardiac Pacemaker – Function, Implantation and Living with One

A cardiac pacemaker is a small implanted medical device that delivers electrical impulses to regulate a heartbeat that is too slow or irregular, helping the heart maintain a normal rhythm.

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Things worth knowing about "Cardiac Pacemaker"

A cardiac pacemaker is a small implanted medical device that delivers electrical impulses to regulate a heartbeat that is too slow or irregular, helping the heart maintain a normal rhythm.

What is a Cardiac Pacemaker?

A cardiac pacemaker is a small, surgically implanted device that sends electrical impulses to the heart muscle to help maintain a normal heart rhythm. It is used when the heart's natural electrical conduction system fails to function correctly, causing the heart to beat too slowly (bradycardia) or to pause abnormally. The device consists of a pulse generator (containing a battery and electronic circuitry) and one or more leads (thin, insulated wires) that are guided into the heart chambers.

Types of Cardiac Pacemakers

Several types of pacemakers are available, chosen based on the patient's specific condition and needs:

Single-chamber pacemaker: One lead is placed in the right ventricle or right atrium.
Dual-chamber pacemaker: Two leads are used -- one in the right atrium and one in the right ventricle -- to coordinate the timing of contractions.
Biventricular pacemaker (CRT): Three leads synchronize both ventricles, primarily used in patients with heart failure.
Leadless pacemaker: A miniaturized, self-contained device implanted directly into the right ventricle without traditional leads.

Indications – When is a Pacemaker Needed?

A pacemaker is recommended when the heart beats too slowly or irregularly, causing symptoms. Common indications include:

Bradycardia: A consistently slow heart rate (below 60 beats per minute) associated with symptoms such as dizziness, fainting, or shortness of breath.
AV block: A disruption in the electrical signal between the atria and the ventricles of the heart.
Sick sinus syndrome: Dysfunction of the heart's natural pacemaker (the sinoatrial node).
Heart failure: In certain forms, a biventricular pacemaker is used for cardiac resynchronization therapy.

The Procedure – Pacemaker Implantation

Pacemaker implantation is a minimally invasive procedure typically performed under local anesthesia with mild sedation. The surgery usually takes between 30 and 90 minutes.

Steps of the Procedure

A small incision is made below the collarbone.
The leads are guided through a vein into the heart and positioned in the appropriate chambers.
The pulse generator is placed in a small pocket created under the skin below the collarbone.
After surgery, the device is programmed and tested to ensure proper function.

Living with a Cardiac Pacemaker

Most patients can lead a largely normal life after receiving a pacemaker. Key considerations include:

Follow-up checks: Regular monitoring every 6 to 12 months is essential to assess device function and battery status.
Battery replacement: The battery typically lasts 5 to 15 years, after which the pulse generator must be replaced.
Electromagnetic interference: Strong electromagnetic fields (e.g., certain industrial equipment) can affect device function. However, many modern pacemakers are MRI-compatible.
Pacemaker identification card: Patients receive an ID card with device details that should be carried at all times.

Possible Risks and Complications

As with any surgical procedure, complications can occur, though they are generally uncommon:

Infection at the wound site or around the device
Bleeding or bruising (hematoma)
Lead dislodgement or malposition
Pneumothorax (air in the chest cavity) as a rare complication
Device malfunction or battery failure

References

Brignole M. et al. -- 2021 ESC Guidelines on cardiac pacing and cardiac resynchronization therapy. European Heart Journal, 2021. doi:10.1093/eurheartj/ehab364
Epstein AE et al. -- ACC/AHA/HRS 2008 Guidelines for Device-Based Therapy of Cardiac Rhythm Abnormalities. Journal of the American College of Cardiology, 2008. doi:10.1016/j.jacc.2008.02.032
Zipes DP et al. -- Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine. 11th Edition, Elsevier, 2018.

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