Why Does My Implantable Cardioverter Defibrillator (ICD) Have a Pacemaker?

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Well, when you implant an implant a defibrillator basically you're going through the same steps as implanting a pacemaker. Many of these patients might later on succumb to low heart rates requiring a pace maker. So does not make sense to ex-plant the older device, and re-implant another one which is not very easy.

As well at times when the defibrillator shocks you and that's the main purpose of it, for period of time your heart might stop before restarting and at that time the pace maker can kick in and keep you alive.