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7. Some Useful Information about Blood Pressure
EN
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.
80
180
160
140
130
120
85
90
100
110
Systolic blood pressure 
(mmHg)
Severe hypertension
Moderate hypertension
Mild hypertension
Normal systolic value
Normal blood 
pressure
Optimal blood 
pressure 
(target value)
Diastolic 
blood 
pressure 
(mmHg)
HEM-7211-E_A_M_main.book  Page 25  Thursday, October 7, 2010  2:51 PM