SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Blood pressure measurement. A male nurse uses a sphygmomanometer to measure the blood pressure of a 9-year-old girl. The girl is in hospital with acute lymphoblastic leukaemia, a type of blood cancer. An inflated cuff is wrapped around the girl's upper arm and the nurse uses a stethoscope to listen to blood in an artery. Next to the girl is a grey calibrated glass column of mercury, part of the sphygmomanometer that gives the blood pressure reading. Blood pressure, measured as the pressure of blood exerted on the walls of the blood vessels, is an important indication of the health of the heart and of the patient.
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