NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,614 terms related to cancer and medicine.
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- A small device used to correct a heartbeat that is abnormal (too fast, too slow, or irregular). The device is placed by surgery in the chest or abdomen. Wires are passed through a vein to connect the device to the heart. When it detects abnormal heartbeats, it sends an electrical shock to the heart to restore the heartbeat to normal. Also called implantable cardioverter-defibrillator.