What is an ICD implant and who needs one?
An implantable cardioverter defibrillator (ICD) is a small battery-powered device placed under the skin of the chest to monitor heart rhythm and deliver an electric shock when a life-threatening arrhythmia is detected. It is primarily used to prevent sudden cardiac arrest in patients with serious heart rhythm disorders. S.L. Raheja Hospital in Mumbai offers Pacemaker and ICD implantation through its Cardiac Science programme.
Tip: An ICD is not the same as a pacemaker. While both devices manage heart rhythm, an ICD is specifically designed to detect and terminate dangerous arrhythmias such as ventricular fibrillation.
Conditions that commonly require an ICD include:
- Survived sudden cardiac arrest
- Ventricular tachycardia or ventricular fibrillation
- Severely reduced heart function (low ejection fraction)
- Inherited heart conditions such as hypertrophic cardiomyopathy or long QT syndrome
- Heart failure with high risk of sudden cardiac death
What is the difference between a pacemaker and an ICD?
Both devices are implanted in the chest and use electrical signals to manage the heart, but they serve distinct purposes. Understanding the difference helps patients and families make informed decisions.
| Feature | Pacemaker | ICD |
|---|---|---|
| Primary function | Prevents heart rate from going too slow | Detects and stops dangerously fast or chaotic rhythms |
| Shock delivery | No | Yes — delivers defibrillation shock when needed |
| Pacing capability | Yes | Yes — most ICDs also pace the heart |
| Typical candidates | Bradycardia, heart block | Ventricular arrhythmia, low ejection fraction, cardiac arrest survivors |
Some patients require a combined device that functions as both a pacemaker and an ICD. Your cardiologist will determine the appropriate device based on your specific diagnosis and risk profile.
Is ICD implantation a major surgery, and what does it involve?
ICD implantation is considered a minimally invasive surgical procedure, typically performed under local anaesthesia with sedation. It is not open-heart surgery. Most patients are admitted for one to two days.
The procedure generally follows these steps:
- A small incision is made below the collarbone.
- One or more leads (thin, insulated wires) are guided through a vein into the heart under X-ray guidance.
- The leads are connected to the ICD generator, which is placed in a pocket created under the skin.
- The device is tested to confirm it detects and responds to abnormal rhythms correctly.
- The incision is closed and the patient is monitored in recovery.
Tip: The entire implantation procedure typically takes one to three hours. Patients are usually able to walk the same day and are discharged within 24–48 hours, depending on their overall condition.
Before surgery, your cardiac team will review your medications, perform baseline tests, and advise you on fasting requirements. Inform your doctor about all medications, including blood thinners, as dosing adjustments may be needed.
What should patients expect during ICD surgery recovery?
Recovery after ICD implantation is generally straightforward for most patients. The first few weeks are the most important for wound healing and device stabilisation.
In the first 1–4 weeks:
- Avoid lifting the arm on the implant side above shoulder height.
- Keep the incision site clean and dry; watch for signs of infection such as redness, swelling, or discharge.
- Refrain from strenuous physical activity and heavy lifting.
- Attend your scheduled device check appointment — the ICD will be interrogated to confirm correct function.
Ongoing precautions:
- Carry your ICD identification card at all times — it is required at airport security and before any medical procedure.
- Maintain a safe distance from strong magnetic fields (MRI machines, industrial equipment, certain power tools).
- Inform all treating doctors and dentists that you have an ICD before any procedure.
- Mobile phones and most household appliances are generally safe; keep mobile phones at least 15 cm from the device.
Warning: If you receive an ICD shock, sit or lie down immediately. A single shock with rapid recovery may not require emergency care, but call your cardiac team the same day. Multiple shocks in a short period require immediate emergency attention — call emergency services without delay.
Can you live a normal life with an ICD?
The majority of patients with an ICD are able to return to most normal daily activities, including work, travel, and moderate exercise. The device works silently in the background and only activates when a dangerous rhythm is detected.
Activities that are generally safe:
- Walking, swimming, and moderate aerobic exercise (as cleared by your cardiologist)
- Driving — typically permitted after a waiting period determined by your doctor and local regulations
- Sexual activity — usually safe once your cardiologist confirms recovery
- Air travel — inform airport security staff; the device will not be damaged by walk-through metal detectors, though hand-held wand scanners should be kept away from the device
- Sleeping on either side, including the side of the implant, once the wound has healed
Activities to discuss with your cardiologist:
- Contact sports or high-impact activities
- Operating heavy machinery
- Occupations involving strong electromagnetic fields
Device longevity varies by model and how frequently it is used, but most ICD generators last 5 to 10 years before the battery requires replacement. Your cardiac team will monitor battery status at each follow-up visit.
When should you see a cardiologist about an ICD?
Seek prompt medical review if you experience any of the following after ICD implantation or if you have not yet been assessed but are at risk:
- You have survived a sudden cardiac arrest or an episode of ventricular fibrillation
- You experience recurrent fainting (syncope) without a clear cause
- You have been diagnosed with a heart ejection fraction below 35%
- You have an inherited arrhythmia condition such as Brugada syndrome, long QT syndrome, or hypertrophic cardiomyopathy
- You receive an ICD shock — even if you feel well afterwards, contact your cardiac team the same day
- You notice swelling, redness, or pain at the implant site more than 48 hours after surgery
- You experience persistent palpitations, dizziness, or shortness of breath after device implantation
Do not wait for a scheduled appointment if symptoms are sudden or severe. Use the booking form on this page to arrange an urgent cardiology review.
How does S.L. Raheja Hospital support patients needing an ICD in Mumbai?
S.L. Raheja Hospital in Mumbai, located at Mahim West, provides structured cardiac care for patients requiring arrhythmia management, including ICD and pacemaker implantation. The hospital's Cardiac Science department manages the full patient journey — from pre-procedure evaluation and device selection through to post-implant follow-up and device interrogation.
For patients with complex needs, the team coordinates with related specialities. Patients with diabetes, for example, benefit from integrated care through the hospital's diabetes management programme, given the elevated cardiac risk in this population. Where cancer treatment intersects with cardiac care, the Medical Oncology team works alongside cardiologists to manage device safety during therapy.
Book a cardiac consultation at S.L. Raheja Hospital
Use the booking form on this page, or email us at info@rahejahospital.com to arrange an appointment with our cardiac team.