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Blood pressure gauge

Blood pressure gauge

M390/0695

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Credit

MARK SYKES / SCIENCE PHOTO LIBRARY MARK SYKES / SCIENCE PHOTO LIBRARY

Caption

Blood pressure gauge. This dial is part of a sphygmomanometer used to measure blood pressure in millimetres of mercury (mmHg). An inflatable cuff (not seen) is placed around the upper arm and inflated using a pump (lower right) until blood flow in the arm stops. The cuff is then gradually deflated until pulsing blood flow is heard through a stethoscope. The reading on the blood pressure gauge at this point is the systolic pressure, which occurs during a heartbeat. The diastolic pressure, when the heart is relaxed, is taken by deflating the cuff until blood flows smoothly. Blood pressure is an important measure of health.

Release details

Model release not required. Property release not required.

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