ALAIN DEX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY ALAIN DEX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Blood pressure measurement. Blood pressure measurement using stethoscope (held under the arm) and a sphygmomanometer or pressure gauge and cuff. The cuff is inflated by a pump until blood flow is stopped in a main artery. By slowly deflating the cuff and listening for the return of blood flow, the blood pressure during a heartbeat (systolic pressure) is recorded. Further cuff deflation gives the blood pressure between heartbeats (diastolic pressure). Blood pressure is then expressed as a difference between these two measurements, in millimetres of mercury (mm Hg).
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