ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Ambulanceman using a portable defibrillator machine in an attempt to revive a man who has suffered a heart attack. A defibrillator delivers a controlled electric shock to restore normal heart rhythm in cases of cardiac arrest due to ventricular fibrillation (a rapid and chaotic beating of the many individual muscle fibres of the heart).
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