Risks and benefits of ICD placement
Informed by recognized medical guidance
Overview
An implantable cardioverter-defibrillator (ICD) is a small battery-powered device placed under the skin of your chest to monitor your heart rhythm. If it detects a dangerously fast or irregular heartbeat, it sends a mild or strong electrical shock to restore a normal rhythm. This can prevent sudden cardiac arrest.
Key facts
- ICDs are used to prevent sudden cardiac death in people with certain heart conditions.
- The device is implanted during a minor surgical procedure, usually under local anaesthetic with sedation.
- Most people with an ICD can live a normal, active life, but there are some limitations and risks.
ICD placement is a fairly common procedure. Thousands of people receive an ICD each year, especially those who have survived a cardiac arrest or have heart failure with a low ejection fraction.
People who have had a heart attack, have heart failure, or have a genetic condition that causes dangerous arrhythmias (such as long QT syndrome or Brugada syndrome) may be candidates for an ICD.
Symptoms
- You receive a shock and feel chest pain, shortness of breath, or faintness.
- You receive multiple shocks in a row (more than one) without feeling better.
- The ICD makes a beeping sound (some models alert you to a problem).
- You have signs of infection at the incision site: redness, swelling, warmth, or pus, with fever.
- ⚠The incision site is swollen, red, or draining fluid but you have no fever.
- ⚠You feel dizzy or have palpitations but are still alert.
- ⚠Your ICD has not fired, but you think it might be malfunctioning (e.g., unusual sounds).
Common symptoms
- Most people do not feel symptoms from the ICD itself, but you may feel a shock if it fires.
- Some people experience palpitations, dizziness, or fainting due to the arrhythmia that triggers the ICD.
Symptoms in children
- Children may need an ICD for genetic arrhythmia conditions. They may feel anxious about the device or the shocks.
- Children with an ICD might need to limit certain sports or activities to avoid damage to the device.
Symptoms in older adults
- Older adults often have other health conditions that may make surgery riskier, but they can still benefit from an ICD.
- They may need extra care to prevent falls or injuries near the device site.
Causes
Main causes
- Heart attack (myocardial infarction) that damages the heart's electrical system.
- Heart failure with reduced pumping ability (low ejection fraction).
- Genetic heart conditions that cause dangerous arrhythmias, such as long QT syndrome or hypertrophic cardiomyopathy.
Risk factors
- Previous cardiac arrest or sustained ventricular tachycardia.
- Severe heart failure (New York Heart Association class II or III).
- Family history of sudden cardiac death or inherited heart rhythm disorders.
When to see a doctor
See a doctor urgently if:
- If you receive a shock from your ICD and feel unwell, call your local emergency number immediately.
- If you have signs of infection like fever and redness around the device pocket.
Book a routine appointment if:
- Regular follow-up appointments every 3–6 months to check your ICD's battery and leads.
- If you notice any changes in your energy levels, palpitations, or if you are worried about the device.
Diagnosis
The decision to place an ICD is based on your medical history, heart function tests, and risk of sudden cardiac death. Your cardiologist will discuss the benefits and risks with you.
Tests that may be done
- Electrocardiogram (ECG) — records your heart's electrical activity.
- Echocardiogram — an ultrasound of your heart to check its structure and pumping ability.
- Holter monitor — a portable device that records your heart rhythm for 24–48 hours.
- Electrophysiology study — a test where thin wires are threaded into your heart to study its electrical system.
What to expect at your appointment
Before the procedure, you will have blood tests and an assessment by an anaesthetist. The ICD is implanted in a catheter lab or operating room. You will be awake but relaxed with medicine. The doctor makes a small cut under your collarbone, inserts the ICD leads into a vein, and positions them in your heart. The device is then placed under the skin. The whole process takes about 1–2 hours, and you usually go home the same day or the next day.
Treatment
An ICD is a long-term treatment to protect you from dangerous heart rhythms. It does not cure the underlying heart condition, but it can save your life. Alongside the ICD, your doctor may recommend medications to help your heart work better and reduce the chance of arrhythmias.
Self-care at home
- Keep the incision site clean and dry for a few days after surgery.
- Avoid heavy lifting or vigorous arm movement on the side of the ICD for about 4–6 weeks.
- Learn what to do if the ICD shocks you (e.g., stay calm, lie down, call for help if needed).
Medical treatments
Your doctor may prescribe medications to support heart function and reduce arrhythmias, such as beta-blockers, ACE inhibitors, or antiarrhythmic drugs. They might also adjust the ICD's settings to optimise therapy. These treatments are tailored to your specific condition.
Living with this condition
After the first few weeks, you can usually return to normal activities. You will need to avoid strong magnetic fields (like MRI machines without special precautions) and keep mobile phones away from the device. You will have regular check-ups to monitor the ICD.
Lifestyle tips
- Avoid contact sports that could damage the device, like football or boxing.
- Tell all healthcare providers (dentists, surgeons) that you have an ICD.
- Carry an ICD identification card at all times.
Diet and exercise
A heart-healthy diet low in salt and saturated fat is recommended. Light to moderate exercise, like walking or swimming, is usually safe and beneficial. Ask your doctor for specific activity guidelines.
Mental health and emotional wellbeing
Living with an ICD can cause anxiety, especially about receiving shocks or device failure. It is normal to feel worried. Talking to a counsellor or joining a support group can help. Some people also benefit from relaxation techniques.
Prevention
You cannot prevent the need for an ICD if you have a serious heart condition, but you can reduce the risk of complications by taking care of the device site and attending regular check-ups.
Screening programmes
If you have a family history of sudden cardiac death or inherited heart rhythm disorders, genetic testing and screening of relatives may be recommended to identify others who might benefit from an ICD.
Complications
If left untreated
- Without an ICD, you are at high risk of sudden cardiac arrest if a dangerous arrhythmia occurs.
- Recurrent fainting or dizziness could lead to falls and injuries.
- Heart failure might worsen without protection from arrhythmias.
Long-term outlook
Most people with an ICD live long, active lives. The device significantly reduces the risk of sudden death. While there are risks from the surgery and device, modern ICDs are reliable and safe. With proper follow-up and a healthy lifestyle, the outlook is very positive.
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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.
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Sources and guidance
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 18, 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.