NIBP Measurements NIBP Monitoring
7 - 10 0070- 0-0704-02 Passport V Operating Instructions
7.4.7 Cuff Inflation Timeout
If the cuff pressure does not attain 15mmHg within 20 seconds for adult and pediatric, or
15mmHg within 10 seconds for neonate, then the cuff is vented and the message NIBP:
Retry or NIBP: Unable to Measure message is displayed in the lower left corner of the
screen.
The cuff will inflate to 15mmHg within 20 seconds for adult and pediatric, and 15mmHg
within 10 seconds for neonate.
7.4.8 Start and Stop Keys
The Start and Stop keys on the front panel have the following effects on the timed
measurement sequence (Interval or Timer Mode).
Interval Mode is set and you press the Start key:
• An unscheduled measurement is made. Taking this unscheduled measurement does not
affect the timing of the interval cycle, therefore, the scheduled measurements will be
taken as if there were no interruptions. Only one measurement is taken for each
measurement cycle - therefore, if the unscheduled measurement coincides with the
scheduled measurement, it counts as the scheduled measurement. If the interval is
changed without pressing the Stop key, interval measurements will continue at the
newly chosen interval.
Interval Mode is set and you press the Stop key during the measurement:
• The cuff deflates and interval measurements are suspended.
Interval Mode is set and you change the interval:
• The measurement cycle is reset with the new interval. A measurement will be taken
after you press the Start key.
7.4.9 NIBP Auto Time Out Functions
The NIBP data will time out on the display under the following conditions:
• When the elapsed time exceeds the pre-set time out in the installation mode
• If a measurement is unsuccessful, the display values are replaced with “XXX” and a
tone sounds.
7.4.10 Indirect BP Measurements and Associated Errors
Place the patient in a supine position to obtain true physiological pressure. If the cuff is not at
the patient’s heart level, the pressure values obtained will not reflect the true physiological
pressure. Instead, the readings will be decreased by 1.86 mmHg for every inch the cuff is
placed above the heart level and increased by 1.86 mmHg for every inch the cuff is placed
below the heart level. This effect is due to hydrostatic pressure.
Blood weight influences blood pressure readings. The value of the weight of blood depends
on where the measurement is taken with respect to the heart. When the patient is supine, on
a flat surface, the arm is near enough to the heart level that no adjustment of the NIBP
readings is necessary.
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