17 Monitoring Noninvasive Blood Pressure
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A wrong cuff size, and a folded or twisted bladder, can cause inaccurate measurements. The width
of the cuff should be in the range from 37% to 47% of the limb circumference. The inflatable part
of the cuff should be long enough to encircle at least 80% of the limb.
4 Apply the cuff to a limb at the same level as the heart. If it is not, you must use the measurement
correction formula to correct the measurement.
The marking on the cuff must match the artery location. Do not wrap the cuff too tightly around
the limb. It may cause discoloration, and ischemia of the extremities. Inspect the application site
regularly to ensure skin quality and inspect the extremity of the cuffed limb for normal color,
warmth and sensitivity. If the skin quality changes, or if the extremity circulation is being affected,
move the cuff to another site or stop the blood pressure measurements immediately. Check more
frequently when making automatic or stat measurements.
Correcting the Measurement if Limb is not at Heart Level
To correct the measurement if the limb is not at heart level, to the displayed value
Understanding the Numerics
Depending on the numeric size, not all elements may be visible. Your monitor may be configured to
display only the systolic and diastolic values.
Alarm Sources
If you have parallel alarm sources, the sources are displayed instead of the alarm limits.
NBP Timestamp
Depending on your configuration, the time shown beside the NBP numeric can be:
– the time of the most recent NBP measurement, also known as the "timestamp", or
– the time until the next measurement in an automatic series, displayed with a graphic
representation of the remaining time, as shown here.
add 0.75 mmHg (0.10 kPa) for each centimeter
higher or
deduct 0.75 mmHg (0.10 kPa) for each
centimeter lower or
add 1.9 mmHg (0.25 kPa) for each inch higher. deduct 1.9 mmHg (0.25 kPa) for each inch
lower.
1 Alarm source
2 Measurement Mode
3 Timestamp/Timer
4 Mean pressure
5 Diastolic
6 Systolic
7 Alarm limits
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