A. CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY A. CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY
Blood pressure measurement. New mother having her blood pressure measured by a nurse using a sphygmomanometer. A stethoscope (mostly unseen) is being used to listen to the blood flow in the woman's arm. The black arm cuff is inflated by a pump in the nurse's hand until blood flow stops. Next the cuff is relaxed until some blood flow resumes. The reading on the blood pressure gauge (lower centre) at this point corresponds to the systolic pressure, which occurs when the heart is beating. The diastolic pressure, when the heart is relaxed, is taken by deflating the cuff until the blood flows smoothly. Blood pressure is a vital check of overall health. Photographed in Iran.
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