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A sphygmomanometer (/ ˌ s f ɪ ɡ m oʊ m ə ˈ n ɒ m ɪ t ə r / SFIG-moh-mə-NO-mi-tər), also known as a blood pressure monitor, or blood pressure gauge, is a device used to measure blood pressure, composed of an inflatable cuff to collapse and then release the artery under the cuff in a controlled manner, [1] and a mercury or aneroid manometer to measure the pressure.
A minimum systolic value can be roughly estimated by palpation, most often used in emergency situations, but should be used with caution. [10] It has been estimated that, using 50% percentiles, carotid, femoral and radial pulses are present in patients with a systolic blood pressure > 70 mmHg, carotid and femoral pulses alone in patients with systolic blood pressure of > 50 mmHg, and only a ...
During systole, when blood volume increases in the finger, the control system increases cuff pressure, too, until the excess blood volume is squeezed out. On the other hand, during diastole , the blood volume in the finger is decreased; as a result, cuff pressure is lowered and again the overall blood volume remains constant.
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The most common automated blood pressure measurement technique is based on the oscillometric method. [103] Fully automated oscillometric measurement has been available since 1981. [104] This principle has recently been used to measure blood pressure with a smartphone. [105]
Seymour B. London (July 1, 1915 – July 14, 2010) was an American physician and inventor who created the first automatic blood pressure monitor.. London was born on July 1, 1915, in Detroit and moved to Miami Beach, Florida as a youth together with his family, where he graduated from Miami Beach Senior High School in 1932.