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血压和心音的测量.ppt

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血压和心音的测量.ppt

上传人:ranfand 2016/10/5 文件大小:2.02 MB

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血压和心音的测量.ppt

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文档介绍:11What is blood pressureBlood is carried from the heart to all parts of your body in vessels called arteries. Blood pressure is the force of the blood pushing against the walls of the arteries. Each time the heart beats (about 60-70 times a minute at rest), it pumps out blood into the arteries. Your blood pressure is at its highest when the heart beats, pumping the blood. This is called systolic pressure. When the heart is at rest, between beats, your blood pressure falls. This is the diastolic pressure. BLOODPRESSURE22?Blood pressure is always given as these two numbers, the systolic and diastolic pressures. Both are important. Usually they are written one above or before the other, such as 120/80 mmHg. The top number is the systolic and the bottom the diastolic. Blood pressure can vary based on many factors, including age, gender, weight and physical condition. In general, a person's blood pressure is lower during sleep and higher when he or she is active. Blood pressure can change easily in response to physiological changes. The setting in which a person's blood pressure is measured may also affect the pressure changes during the day. It is lowest as you sleep and rises when you get up. It also can rise when you are excited, nervous, or active. Still, for most of your waking hours, your blood pressure stays pretty much the same when you are sitting or standing still. That level should be lower than 120/80. When the level stays high, 140/90 or higher, you have high blood pressure. With high blood pressure, the heart works harder, your arteries take a beating, and your chances of a stroke, heart attack, and kidney problems are greater. BLOODPRESSURE44Categories for Blood Pressure Levelsin Adults(In mmHg, millimeters of mercury)BLOODPRESSURECategorySystolic(Top number)Diastolic(Bottom number)Normal Less than 120Less than 80Prehypertension120-13980-89High Blood PressureSystolicDiastolicStage 1140-15990-99Stage 2160 or higher100 or

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