SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Blood pressure gauge, or sphygmomanometer, in front of a chest X-ray. This type of gauge uses an inflatable cuff around the arm (not seen). The pressure in the cuff needed to cut off blood flow into the patient's arm is a measure of the maximum blood pressure during the heart's cycle (the systolic pressure). The reading shown, almost 170 millimeters of mercury (mm Hg), is very high; a typical healthy value is 120 mm Hg. High blood pressure (hypertension) increases the risk of heart and circulatory disease, stroke, and kidney disease. The gauge can also be used to determine the minimum (diastolic) pressure. A healthy value for this is 80 mm Hg.
Model release not required. Property release not required.