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9.Some Useful Information about Blood Pressure
Classification of Blood Pressure by the World Heath
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.
* There is no universally accepted definition of hypotension.
However, those having the systolic pressure below
100 mmHg are assumed as hypotensive.
Example: fluctuation within a day (male, 35 years old)
mmHg
200
150
100
50
61218 24
Upper curve: systolic blood pressure
Lower curve: diastolic blood pressure
Time of day
Optimal blood
pressure
(target value)
Normal blood
pressure
Normal systolic value
Mild hypertension
Moderate hypertension
Severe hypertension
Systolic blood pressure
(mmHg)
Diastolic
blood
pressure
(mmHg)
80
180
160
140
130
120
85 90 100 110
7051_E.book Page 38 Friday, July 15, 2005 4:36 PM