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An implanted defibrillator can be taken out, but it isn't often advised. Defibrillators are usually used in people with dangerous and life threatening heart rhythm problems. They are usually used along with medications to control episodes of rapid heartrates. The devices are very sophisticated and can recognize different types of rhythm changes. They can be individually programmed to suit the patient.

Most people who have a defibrillator will need one for life. They are watching in "standby" in the background, monitoring the heart rhythm. They treat dangerous rhythms when needed. Unless a person's dangerous rhythm disappears or their heart heals up to an extraordinary degree, they will continue to need the defibrillator as an "insurance policy".

Some people have had them removed at end of life to avoid being treated for a rhythm change, so that they can "die peacefully". Some people have gone so long with no dangerous rhythm treated, that they decide to avoid replacing the ICD when the battery runs down. In this case, the generator itself is removed, but the wires are left in place (it is safer than removing them). And on occasion, even though the device has run down, it is just left in place rather than going through a minor procedure, which still has risk of infection.

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