things to know about blood pressure
3
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. When the heart relaxes between heartbeats, the
lowest blood pressure is diastolic pressure.
What is the standard blood pressure classification?
The blood pressure classification published by World Health Organization (WHO) and International
Society of Hypertension (ISH) in 1999 is as follows:
CAUTION:
Only a physician can tell your normal blood pressure range. Please contact a physician if your
measuring result falls out of the range. Please note that only a physician can tell whether your blood
pressure value has reached a dangerous point.
Blood pres-
sure (mmHg)
Hypotonia
(degraded
bl. pr.)
Optimal Normal High normal Mild
hypertension
(Grade I)
Moderate
hypertension
(Grade II)
Severe
hypertension
(Grade III)
SYS < 105 106-120 120-129 130-139 140-159 160-179 > 180
DIA < 60 < 60-80 80-84 85-89 90-99 100-109 > 110
press
artery
vein
blood discharging
Systolic
relax
blood entering
Diastolic
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