高级 - B.P设备水星 - NSL

Digital B.P Apparatus is most commonly measured via a血压计, which historically used the height of a column of mercury to reflect the circulating pressure.^[1]Blood pressure values are generally reported inmillimetres of mercury(mmHg), though aneroid and electronic devices do not contain汞.

For each heartbeat, blood pressure varies between systolic and diastolic pressures. Systolic pressure is peak pressure in the arteries, which occurs near the end of thecardiac cyclewhen theventricles正在签约。舒张压是动脉中的最小压力，当心室充满血液时，它发生在心脏周期的开头附近。静息，健康的成年人的正常测量值的一个示例为120 mmHgsystolicand 80 mmHgdiastolic(written as 120/80 mmHg, and spoken as “one-twenty over eighty”).

收缩和舒张动脉血压不是静态的，而是从一个心跳到另一个心跳的自然变化（在circadian韵律）。他们也会改变压力, nutritional factors,毒品，疾病，运动​​，momentarily from standing up. Sometimes the variations are large.Hypertension指动脉压异常高，而不是hypotension, when it is abnormally low. Along withbody temperature,respiratory rate， 和pulse rate, blood pressure is one of the four main vital signs routinely monitored by medical professionals and healthcare providers.^[2]

测量压力invasively，通过穿透动脉壁进行测量，通常不常见，通常仅限于医院环境。