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Blood pressure gauge (sphygmomanometer). This gauge measures blood pressure using a cuff (not seen) that is inflated around a patient's arm. Blood flow is restricted as the cuff is inflated using a pump (bottom left). When the flow of blood can no longer be heard, the cuff is slowly deflated and two readings relating to the strength of the patient's pulse are taken. These two readings make up the patient's blood pressure and are expressed in millimetres of mercury (mmHg). Abnormally high blood pressure can lead to health problems such as a stroke and heart failure.
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