defibrillator

noun

1. An electronic device used internally or externally that delivers a controlled electric shock to a patient to correct ventricular fibrillation, a lack of coordination of the contraction of muscle tissue of the large chambers of the heart.

   “Two deaths have been linked to St. Jude Medical heart defibrillators with batteries that failed. […] Losing battery in a defibrillator could mean the failure of pacing heartbeats or delivering shocks, a potentially deadly consequence for cardiac patients.”

   “High intensity EMF can have adverse impacts on the operation of implantable medical devices (IMDs) such as pacemakers and defibrillators.”