STEVIE GRAND / SCIENCE PHOTO LIBRARY STEVIE GRAND / SCIENCE PHOTO LIBRARY
Emergency team resuscitating a patient in cardiac arrest. When defibrillation (delivery of an electric shock to the chest wall) is delayed or unsuccessful in restoring normal heart rhythm, heart massage and artificial respiration are necessary. The doctor (left) is compressing the patient's chest 60 to 80 times per minute to try to stimulate the heart, while artificial respiration is provided at about 12 breaths per minute.
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