Hypotension refers to the state in which the arterial pressure of systemic circulation is lower than normal. Because hypertension often causes damage to important organs such as heart, brain and kidney in clinic, it has attracted much attention. The World Health Organization also has clear provisions on the diagnostic criteria of hypertension, but there is no unified standard for the diagnosis of hypotension. It is generally considered that the arterial blood pressure of the upper limb in adults is lower than 90 / 60mmhg (12 / 8 kPa). According to the etiology, it can be divided into physiological and pathological hypotension, and according to the form of onset, it can be divided into acute and chronic hypotension.
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