If you die with an implanted defibrillator (ICD) still active, the device can continue delivering electrical shocks to your body after your heart stops. The device doesn’t know you’ve died. It detects abnormal heart rhythms and responds the way it was programmed to, even when those rhythms are part of the natural dying process. About 31% of patients with active ICDs receive at least one shock in the last 24 hours of life, and for family members witnessing this, the experience can be deeply distressing.
Why the Device Keeps Firing
An ICD monitors your heart rhythm around the clock. When it detects a dangerously fast or chaotic rhythm, it delivers a shock to reset the heart. During the dying process, these abnormal rhythms are extremely common. Roughly 35% of patients experience them in the final hour of life, and about 24% develop what’s called an arrhythmic storm, where the heart cycles rapidly through disordered rhythms. Each time the heart enters one of those patterns, the ICD treats it as an emergency and fires.
The device has no way to distinguish between a survivable cardiac event and the heart’s final collapse. It simply reacts to electrical patterns that fall within its programmed zones. In some cases, it even fires inappropriately, responding to signals that aren’t true emergencies. In one study, 13% of shocks delivered near death were triggered by non-life-threatening rhythms or electrical noise the device misread.
What It Looks Like for Family Members
The physical effect of a defibrillator shock is significant. Patients who are conscious typically describe a cardioversion shock as a thump in the chest and a full defibrillation shock as a kick. The device delivers 30 to 40 joules of energy at roughly 800 volts.
When this happens after death, the results can be alarming. Hospice workers have described bodies jerking, limbs flailing, and in some cases the force lifting the person off the bed. In one account from an Oregon hospice, a bath aide was present when a patient’s husband died. After he stopped breathing, the ICD continued shocking his body, causing his arms and legs to jump. The aide wrapped the body tightly to stop the movement. In another case, a patient with lung cancer was found “jerking” in bed after death, with the initial shocks strong enough to lift him. Both incidents were described as deeply traumatic for the family members and staff present.
ICDs vs. Pacemakers at End of Life
Pacemakers and ICDs work very differently, and this matters at end of life. A pacemaker sends continuous, low-energy electrical pulses to keep the heart beating at a steady rate. It replaces a function the heart can no longer perform on its own. For someone who depends entirely on their pacemaker, turning it off could cause near-instantaneous death because the heart has no backup rhythm to fall back on.
An ICD, by contrast, is reactive. It sits quietly until it detects a dangerous rhythm, then intervenes. Deactivating the shock function doesn’t stop the heart from beating. It simply allows the heart to follow its natural course without being jolted back. This is why deactivating an ICD at end of life is widely considered ethically and medically appropriate, while deactivating a pacemaker raises more complex questions. Many modern devices combine both functions, so a clinician can turn off the shock therapy while leaving the pacing function intact.
How Deactivation Works
There are two ways to stop an ICD from delivering shocks. The permanent method uses a programmer, a device similar to a small laptop that communicates wirelessly with the implant. A cardiologist, electrophysiologist, or specially trained technician places the programmer near the chest and reprograms the ICD to disable shock therapy. This is a one-time change that lasts until someone reprograms it again.
The temporary method uses a magnet designed for cardiac devices. Placing it directly over the ICD prevents the device from sensing heart rhythms, which means it won’t detect anything to shock. The magnet must stay in place, usually taped to the chest, because the ICD will resume sensing the moment it’s removed. Hospice programs often leave a magnet in the home so family members can use it in an emergency if the patient starts receiving repeated shocks.
One important detail: at least one ICD model has been known to permanently deactivate its shock function after brief magnet exposure. If you’re unsure about the specifications of a particular device, the safest approach is to keep the magnet in place until a professional can confirm the settings.
When to Have the Conversation
Clinical guidelines from the Heart Rhythm Society and the European Heart Rhythm Association recommend that the possibility of deactivation be discussed at the time the ICD is first implanted. In practice, this rarely happens. The topic typically comes up much later, if at all, often only when a patient enters hospice or receives a do-not-resuscitate order.
Even among patients with DNR orders, devices remain active more than half the time. This disconnect means many people who have explicitly chosen comfort-focused care at the end of life are still receiving painful shocks. The guidelines are clear: when a patient has a DNR order or enters palliative care, a conversation about deactivating the ICD’s shock function should happen at the same time. At minimum, deactivation should be offered.
If deactivation can’t be arranged quickly, a physician can place a magnet over the device as a bridge. For patients who can travel, an outpatient visit with a device clinic can be scheduled. For those who can’t, a clinician or device company representative can come to the patient’s home or hospice facility with the necessary equipment. The programmer must match the ICD’s manufacturer, so knowing which company made the device is essential.
Addressing It in Advance Directives
Standard advance directives and living wills often don’t mention implanted cardiac devices specifically, which creates a gap. You can close that gap by including explicit language about your ICD. Patients who have done this use phrases like “I do not wish to have artificial mechanisms which artificially prolong my life” or “I do not wish to be resuscitated if my heart stops.” Some go further, naming the device directly and requesting that shock therapy be turned off if recovery is no longer expected.
A common misconception is that ICD deactivation is a form of euthanasia or assisted death. The American Heart Rhythm Society has drawn a clear legal and ethical distinction: euthanasia or assisted death requires adding something to cause death, while ICD deactivation removes a treatment and allows the underlying disease to take its natural course. Deactivation is legally classified as withdrawal of treatment, the same category as removing a ventilator or stopping dialysis.
What Happens to the Device After Death
After someone with an ICD dies, the device needs to be removed before cremation. The lithium battery inside can explode when exposed to the extreme heat of a cremation oven, posing a safety risk to crematorium staff and potentially damaging equipment. Even burial typically involves device removal, though the urgency is lower.
Removing an ICD from a deceased person carries its own risks. The device may still be capable of delivering a shock, so the person performing the removal takes precautions. The standard approach is to first deactivate the device using a programmer or magnet. If neither is available, the person wears two pairs of neoprene gloves on each hand for insulation. The device is dissected free, placed outside the body, and wrapped in glove material. The leads are then cut close to the device with a quick, sharp cut, avoiding contact with both hands simultaneously to prevent completing an electrical circuit. Once removed and disconnected, the ICD detects high impedance and typically disables itself.