EN
12
6. ABOUT BLOOD PRESSURE
6.1 WHAT ARE SYSTOLIC PRESSURE AND DIASTOLIC PRESSURE?
When ventricles contract and pump blood out of
the heart, blood pressure reaches its maximum
value, the highest pressure in the cycle is known as
systolic pressure.
press
artery
vein
blood discharging
Systolic
relax
blood entering
Diastolic
When the heart relaxes between heartbeats, the lowest blood pressure is
diastolic pressure.
6.2 WHAT IS THE STANDARD BLOOD PRESSURE CLASSIFICATION?
e blood pressure
classication publi-
shed by World He-
alth Organization
(WHO) and Inter-
national Society of
Hypertension (ISH)
in 1999 is as follows:
Hight-
SYS
DIA
<120
<80
120~129
80~84
130~139
85~89
140~159
90~99
160~179
100~109
180
110
Blood
pressure
(mmHg)
Level
Optimal Normal Mild Moderate SevereNormal
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