What is a pacemaker?
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A pacemaker is a battery-powered implantable device that electrically stimulates the heart to contract and pump blood throughout the body in cases where the heart's electrical system is dysfunctional. The instrument is usually about the size of two half dollars and is implanted directly into the chest.
Through a wire attached directly to the heart, artificial pacemakers regulate heartbeat in patients by means of subtle continuous electric shocks. Unfortunately a hermetic seal on some Guidant devices may fail, causing moisture to seep in and potentially damage the device. There has been at least one death thought to be associated with this failure.
What
is a defibrillator?
