How does an implantable cardioverter defibrillator work?

An ICD is a small device implanted in your chest, under the skin, that keeps track of your heart rate.

ICDs are a suitable treatment option for people who suffer from a recurrent irregular heartbeat (arrhythmia). Sometimes this condition can be kept under control with medicine, but when these medicines don't work, an ICD implant may be the right solution. 
The ICD device consists of two parts: a pulse generator that is placed under the skin somewhere above the waistline, and one or two wires that connect the device to your heart. The device keeps track of your heart rate, if it detects an irregular heartbeat, it sends out a short burst of electrical impulses to your heart. If the heart does not restore its normal heartbeat, the device shocks the heart to restore a normal heart rhythm. The ICD also records information about the event such as time and date and other data that helps your doctor optimize the device for your needs. 

Disclaimer: We do not assume responsibility for the use of the provided information or its interpretation. Our efforts are towards providing current and reliable information; however these should not be considered, or used as a substitute for diagnosis or treatment.

Source: https://www.cedars-sinai.edu/Education/Medical-Library/

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