Everyday Measurements

血压单位

定义

血压以毫米汞柱（mmHg）为单位测量，表示为两个值：收缩压（心脏收缩时）/舒张压（心脏舒张时），例如120/80 mmHg。

解释

The unit dates to the mercury manometers used in early sphygmomanometers, where pressure literally raised a column of liquid mercury. Normal adult blood pressure is below 120/80 mmHg; hypertension stage 1 begins at 130/80 mmHg. Although mercury instruments are now largely replaced by electronic sensors for safety reasons, mmHg remains the universal clinical standard because of its century-long reference base.

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