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by Wang Yuechun
Measurement of
arterial blood pressure Aim:
To understand the principle of indirect measurementof blood pressure (To measure arterial blood
pressure in human body with the auscultatorymethod.)
To measure the systolic and diastolic pressures ofbrachial artery.
Subect: human
!"uipments:
stethoscope
sphygmomanometer (blood pressure gauge)
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More definitions
ypertension% $!S*ST!+T ele,ation of
either diastolic or systolic blood pressure
!ssential (primary) hypertension% high bloodpressure with no identifiable cause
Secondary hypertension% high blood
pressure with a -nown cause
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!S Wor-shop /u&embourg
11 April 2334
Measurement de,ices
Aneroid
sphygmomanometer Simple mercury
sphygmomanometer
Automated bp de,ice
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An aneroidSphygmoma
%nometer
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by Wang Yuechun
$rocedure and obser,ation
1.The structure of a sphygmomanometer.
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$ r e s s u
r e 5 m m (
g
The sphygmomanometer detects arterial opening and closing that occursbetween systolic and diastolic pressures.
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by Wang Yuechun
Method (indirect)
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by Wang Yuechun
The method of measuring
arterial blood pressure
1) A stethoscope is placed o,er the brachial
artery in the elbow while a pressure cuff is
inflated around the upper arm and
connected to a manometer
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c u f f o c c l u d e d
b l o o d , e s s e l
The pressure of the cuff occludes the blood ,essel.
When the arterial pressure is greater than the pressure applied by the cuff
6orot-off sounds are created and blood pressure can be measured.
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2) 7ust as soon as the pressure in the cuff
falls below systolic pressure le,elsounds
can be heard as blood slipping through the
,ery narrow artery and this pressure le,el
indicated by the mamometer appro&imately
e"uals to the systolic pressure.
by Wang Yuechun
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8) When the pressure in the cuff falls to
e"ual to diastolic pressure the sounds
suddenly change to a muffled "uality and
this pressure le,el indicated by the
manometer e"uals to the diastolic pressure
by Wang Yuechun
8/17/2019 Measure Blood Pressure
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by Wang Yuechun
The blood pressure of students in group X (mmHg)
Name Sex age systolic blood pressure diastolic blood pressure
esults
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'iscussion "uestions
by Wang Yuechun
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Steps for Measuring
#lood $ressure
Seated for 9 minutes
!&pose pper arm
;enter of upper arm at heart le,el ;uff applied 1 inch abo,e crease at elbow
/ocate brachial artery
$alpate radial pulse *nflate cuff until pulse disappears
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Steps for measuring cont.
/et air out
$lace stethoscope on brachial artery
$ump up cuff to 23%83 abo,e point of
obliteration
/et air out at 2 mmg per second millimetre( s ) of mercury