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ICD defibrillator overview
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An ICD (implantable cardioverter-defibrillator) is a small, battery-powered device placed under the skin of your chest. It constantly checks your heart rhythm and gives a quick electric shock if it detects a dangerously fast rhythm that could lead to sudden cardiac arrest.
Key facts
ICDs are recommended for people at high risk of sudden cardiac death, such as those with severe heart failure or certain inherited heart conditions. Use has become more common as the population ages and survival from heart attacks improves.
It affects people who have had a heart attack that damaged the heart muscle, people with heart muscle weakness (cardiomyopathy), or those with rare genetic conditions that cause dangerous heart rhythms.
Before getting an ICD, doctors perform tests to see if your heart is at risk of dangerous rhythms. The device itself is implanted in a short surgical procedure.
The implant surgery is usually done with a local anaesthetic and sedation, so you are awake but relaxed. It takes about an hour to two hours. You will likely stay in hospital overnight and go home the next day.
An ICD is a device that continuously tracks your heart rhythm. If it detects a dangerous fast rhythm, it sends a brief electrical shock to restore a normal beat. Some devices also act as a pacemaker.
The only medical treatment is the ICD itself. Your doctor may also prescribe medications to help your heart work better and reduce the chance of the device having to fire. The device is programmed individually for you.
Implanting the ICD is a surgery. In rare cases, another surgery may be needed to replace the battery (every 5 to 10 years) or to fix or replace the leads (wires) that connect the device to your heart.
Most people return to normal daily activities within a few weeks. Avoid strong magnetic fields, such as large MRI machines, and keep your mobile phone at least 15 cm (6 inches) from the device.
Eat a heart-healthy diet rich in fruits, vegetables, whole grains, and low in salt. Moderate exercise like walking, swimming, or cycling is encouraged – ask your doctor when it is safe to start.
It is normal to feel anxious or worried about your ICD, especially after it fires. Some people feel depressed or have trouble sleeping. If you are struggling, talk to your doctor or a mental health professional. If you have thoughts of harming yourself, please call your local emergency number or a crisis helpline immediately.
An ICD is a treatment, not a prevention of heart disease. But managing your underlying heart condition with medication, a healthy lifestyle, and regular check-ups can reduce the chance of dangerous rhythms and the need for shocks.
ICDs are very good at stopping dangerous rhythms and saving lives. With proper care and follow-up, most people live long, active, and fulfilling lives. The device becomes a part of you, and many people feel safer knowing it is there.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 9, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.