A&D TM-2440 - Page 87

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Blood pressure measurement Error factors
The pulse graph can be an objective indicator of
the reliability of the measurement accuracy.
When noise occurs due to irregular heart beat or
physical movements, the amplitude of the graph
changes. When the pulse graph is not a smooth
outline, check again or use other methods.
Cuff position at the same height as heart
Wrap the cuff on the arm at the same level as the heart. If the cuff
position is incorrect, a measurement error occurs. For example, if the
cuff is 10 cm lower than the heart level, the blood pressure is
measured 7 mmHg higher.
Cuff pressure (Left arm
)
Direct method (Left arm
)
Cuff pressure (Left arm
)
Systolic blood pressure
A
verag
e
blood pressure
Diastolic blood pressure
Microphone method
Oscillometric
measurement method
Time
Time
Direct method (Left arm
)
Pulse graph