Normal blood pressure is the premise of blood circulation and flow. Blood pressure remains normal under the adjustment of many factors, thus providing sufficient blood volume for various tissues and organs and maintaining normal metabolism. Too low or too high blood pressure will have serious consequences, and the disappearance of blood pressure is a precursor to death, which shows that blood pressure has extremely important biological significance.
Hypertension refers to abnormal increase of arterial blood pressure above normal value, that is, systolic blood pressure ≥ 140mmHg or diastolic blood pressure ≥90mmHg, and hypotension refers to abnormal decrease of arterial blood pressure below normal value, that is, systolic blood pressure ≤90mmHg or diastolic blood pressure ≤60mmHg.
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