Critical hypertension: systolic blood pressure140 ~150mmhg; Diastolic pressure 90 ~ 95 mmhg;
1 grade hypertension (mild): systolic blood pressure140 ~159 mmhg; Diastolic pressure 90 ~ 99 mmhg;
Grade 2 hypertension (moderate): systolic blood pressure160 ~179 mmhg; Diastolic pressure100 ~109 mmhg;
Grade 3 hypertension (severe): systolic blood pressure ≥180 mmhg; Diastolic pressure ≥ 1 10mmHg.
Simple systolic hypertension: systolic blood pressure ≥140 mmhg; Diastolic pressure < 90mmHg。
Note: If the systolic blood pressure and diastolic blood pressure of patients belong to different grades, the higher grade shall prevail; Simple systolic hypertension can also be divided into 1, 2 and 3 grades according to systolic blood pressure level.