An ICD (Implantable Cardioverter Defibrillator) is a small electronic device that helps manage life-threatening heart rhythm problems. According to the provided reference, it is a small electronic device connected to the heart.
What Does an ICD Do?
The primary function of an ICD is to continuously monitor the heart's electrical activity and deliver therapy if a dangerous rhythm is detected.
- Monitoring: The ICD constantly watches the heart for abnormal rhythms (arrhythmias).
- Therapy Delivery: If a life-threatening arrhythmia is detected, the ICD can deliver one or more of the following therapies:
- Pacing: Delivers small electrical impulses to correct minor rhythm disturbances.
- Cardioversion: Delivers a low-energy shock to restore a normal heart rhythm.
- Defibrillation: Delivers a high-energy shock to stop a life-threatening arrhythmia (like ventricular fibrillation).
Why is an ICD Needed?
ICDs are typically implanted in individuals who are at high risk of sudden cardiac arrest due to:
- Previous heart attack.
- Heart failure.
- Inherited heart conditions that increase the risk of arrhythmias.
Example Scenario
Imagine someone with a history of heart failure experiences a sudden, rapid, and chaotic heartbeat (ventricular tachycardia). The ICD detects this dangerous rhythm and automatically delivers a precisely calibrated electrical shock to restore a normal heart rhythm, potentially saving the person's life.
