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Critical hypertension, also known as borderline hypertension, refers to the blood pressure value between normal blood pressure and diagnosed hypertension. The standard set by the World Health Organization is that the normal blood pressure of adults is: systolic blood pressure<130mmHg, diastolic blood pressure<80mmHg. The World Health Organization defines the standard of hypertension as: 130/80mmHg or below for normal adults, 140/90mmHg or above for hypertension, and the critical hypertension is between the above two (130-139/85mmHg).

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