AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Blood pressure measurement. Hospital doctor taking a patient's blood pressure. The cuff (blue) on the patient's arm is connected to a gauge (sphygmomanometer, not seen) that displays the pressure. Blood pressure is measured by inflating the cuff until it stops the flow of blood. It is then slowly deflated until normal flow resumes. The patient's blood pressure is expressed as the pressure of the beating heart as blood flow resumes (systolic) and the pressure of the heart between pumps when the cuff is completely deflated (diastolic).
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