Implantable Cardioverter
Defibrillator (ICD)
Implantable Cardioverter
Defibrillator (ICD)
An ICD is a small device placed under the skin that continuously monitors heart rhythm and treats dangerous fast rhythms to help prevent sudden cardiac arrest.
How an ICD works
The ICD monitors heart rhythm through one or more leads and can deliver painless pacing or a life‑saving shock if needed.
Illustration is simplified for patient education.
Primary prevention
Certain patients with weakened heart muscle or specific conditions may be considered for an ICD to reduce the risk of sudden cardiac arrest.
Secondary prevention
Individuals who have already experienced serious abnormal heart rhythms may benefit from an ICD to help prevent recurrence.
Your care is individualized
ICD candidacy is based on a full clinical evaluation, imaging, and shared decision‑making with your cardiology team.
What to expect
Before your procedure
- Clinic evaluation, ECG/echo and possibly other tests.
- Medication review; fasting instructions if sedation is planned.
- We’ll discuss benefits, risks, and alternatives; bring your questions.
Day of procedure
- Usually local anesthesia with light sedation; small incision below collarbone.
- Lead(s) placed through a vein into the heart using X‑ray guidance and connected to the ICD.
- Device testing and programming; most patients go home same day.
Recovery & activity
- Limit lifting the implant‑side arm above shoulder for several weeks as instructed.
- Keep incision clean/dry; watch for redness, drainage, or fever.
- Gradual return to normal activity; ask about driving rules in your situation.
Before & after (pain interference)
- Remote monitoring may be used to check your device between visits.
- Most household electronics are safe; keep strong magnets/electronics a few inches away from the device.
- Airport/security: carry your device card; screening is usually safe with precautions.
Therapies the ICD can deliver
- Anti‑tachycardia pacing (ATP) to painlessly stop some fast rhythms.
- Cardioversion/ defibrillation shock for dangerous rhythms if needed.
- Ongoing rhythm monitoring and event storage.
Risks /considerations
- Infection, bleeding, pneumothorax, lead dislodgement, or discomfort at the pocket.
- Inappropriate shocks are uncommon but possible; programming and follow‑up help reduce this risk.
- Battery replacement may be needed in future years; leads are evaluated at each visit.
After a shock
- If you feel a shock and are well afterward, contact the clinic for follow‑up.
- If you feel unwell after a shock, or receive multiple shocks, seek emergency care.
- We can review your device data to understand what happened and adjust programming if needed.
Frequently asked questions
Can I get an MRI with an ICD?
Many modern systems allow MRI under specific conditions, depending on components and scan location. We’ll verify your exact device labeling and coordinate with radiology.
Will I feel the therapies?
Anti‑tachycardia pacing is usually not felt. A defibrillation shock can be startling and uncomfortable, but it is brief and delivered only when necessary.
How long does the battery last?
Battery life varies by model and usage. We’ll check your device at each visit and discuss replacement timing well in advance.
This page is for education and does not replace professional medical advice. Device choice and settings are personalized after evaluation.
Considering an ICD?
Our team can review your history and imaging and discuss whether an ICD is appropriate for you.