What is an ICD?
An implantable cardioverter defibrillator (ICD) is a small device placed inside the chest to monitor and treat life-threatening heart rhythms. The ICD continuously tracks the heartbeat and delivers an electric shock when it detects dangerously fast or irregular rhythms such as ventricular tachycardia or ventricular fibrillation — conditions that can lead to sudden cardiac arrest if left untreated.
Who Needs an ICD?
An ICD is recommended for patients who are at high risk of sudden cardiac arrest or have already experienced a life-threatening arrhythmia. Common indications include:
Ventricular tachycardia (VT)
Ventricular fibrillation (VF)
Prior sudden cardiac arrest
Heart failure with low ejection fraction
Hypertrophic cardiomyopathy
Inherited heart rhythm disorders
How is an ICD Implanted?
The procedure is performed under light sedation and typically takes one to two hours. Here is what to expect:
1
The chest area is cleaned and numbed. Light anesthesia is administered — general anesthesia is not required for most patients.
2
Thin, flexible wires (leads) are guided through a vein into the heart under X-ray imaging to ensure precise placement.
3
The ICD device is placed in a small pocket created just beneath the skin below the collarbone and connected to the leads.
4
The device is tested to confirm it detects and treats arrhythmias properly before the incision is closed.
5
Most patients return home within one to two days and resume normal activities within a few weeks.
Key Benefits
Life-Saving Protection
Delivers immediate treatment for dangerous arrhythmias, often before emergency help arrives
Continuous Monitoring
Tracks heart rhythm 24/7 and responds automatically when needed
Pacing Capability
Many ICDs also function as pacemakers to treat slow heart rhythms
Remote Follow-Up
Wirelessly transmits data to your care team for regular remote monitoring
Frequently Asked Questions
Will an ICD affect my daily activities?
Most patients with an ICD lead fully active lives. Your doctor will provide specific guidance on activities to avoid, such as contact sports or certain heavy machinery.
What does it feel like if the ICD fires?
A shock from the ICD is often described as a sudden strong thump in the chest. While it may be startling, it is brief and indicates the device is working as intended to protect your heart.
Is an ICD MRI compatible?
Many newer ICD models are MRI-conditional, meaning MRI scans may be safely performed under specific conditions. Your cardiologist will confirm your device's compatibility.
How long does the ICD battery last?
ICD batteries typically last 5 to 10 years depending on usage. When the battery nears depletion, a routine procedure replaces the device while the leads are usually kept in place.
Protect Your Heart with an ICD
Speak with our heart rhythm specialists to determine if an ICD is the right treatment to protect you from sudden cardiac arrest.
Living with an ICD
The ICD works quietly in the background, offering constant protection around the clock. Patients are encouraged to attend regular follow-up appointments so their care team can review device data, check battery status, and adjust settings as needed. With routine monitoring and healthy lifestyle habits, most patients live active, confident lives knowing their heart is protected every moment of every day.
