ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Close-up of one of the electrodes of a portable defibrillator machine being used 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 fibrillation (a rapid and chaotic beating of the many individual muscle fibres of the heart). The transparent green sheet visible underneath the electrode is a conductive gel pad, used to ensure good conductivity and to prevent burns. Three controls are visible on the defibrillator pad; a dial for selecting the energy required, a black button for charging the device & a red button for delivering the shock.
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