When people refer to an implantable cardioverter defibrillator (ICD), they are actually discussing the system - the defibrillator and the leads.
An implantable cardioverter defibrillator is designed to monitor your heart rhythm 24 hours a day. If your heart is beating too fast or irregularly, the device will first send small painless electrical signals to correct your heart rate (this is called anti-tachycardia pacing or ATP ). If the fast heart rate (tachycardia) continues, the defibrillator will deliver an electric shock to restore your heart to a normal rate. This electric shock is synchronised with the heart’s rhythm as far as possible and is then referred to as cardioversion. If the electric shock cannot be synchronised with the heart’s rhythm, e.g. during ventricular fibrillation, it is referred to as defibrillation.
The implantable cardioverter defibrillator can also treat slow heart rhythms by sending electrical pulses to the heart to correct it.
Your doctor will program the ICD to deliver the most effective therapies for your specific heart condition.
The energy needed for the ICD to work comes from a special battery. How long your battery lasts depends on several factors. Some of these factors include the type of ICD you have, the nature of your heart condition, and how often your ICD provides therapy to your heart.
It could last up to 13 years1. Because your ICD operates using a battery sealed inside the device, the entire device (pulse generator) will need to be replaced when battery power falls to a low level. The leads only need to be changed in exceptional cases.
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Medtronic Cobalt™ XT VR MRI SureScan™ Model DVPC3D4 device manual (example).
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