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9. Some Useful Information about Blood Pressure
Classification of Blood Pressure by the World Health
Organization
The World Health Organization (WHO) and the International Society of
Hypertension (ISH) developed the Blood Pressure Classification
shown in this figure.
This classification is based on the blood pressure values measured on
people in a sitting position in outpatient departments of hospitals.
Note: There is no universally accepted definition of hypotension.
However, those having the systolic pressure below 100 mmHg
are assumed as hypotensive.
mmHg
200
150
100
50
61218 24
Example: fluctuation within a day (male, 35 years old)
Time of day
Upper curve: systolic blood pressure
Lower curve: diastolic blood pressure
80
180
160
140
130
120
85 90 100 110
Diastolic
blood
pressure
(mmHg)
Systolic blood pressure
(mmHg)
Severe hypertension
Moderate hypertension
Mild hypertension
Normal systolic value
Normal blood
pressure
Optimal blood
pressure
(target value)