11 - 3
• Accuracy of NIBP measurement depends on using a cuff of proper size. It is
essential to measure limb circumference and choose a cuff with proper size.
11.3 NIBP Measurement Limitations
Measurement is impossible with heart rate extremes of less than 30 bpm or greater than
300 bpm, or if the patient is on a heart-lung machine. The measurement may be
inaccurate or impossible in the following situations:
■ Regular arterial pressure pulses are hard to detect
■ With excessive and continuous patient movement such as shivering or
convulsions
■ With cardiac arrhythmias
■ With rapid blood pressure changes
■ With severe shock or hypothermia that reduces blood flow to the peripheries
■ On an edematous extremity.
• The effectiveness of this sphygmomanometer has not been established in
pregnant, including pre-eclamptic patients.
11.4 Measurement Modes
In Spot Check mode, there are three NIBP measurement modes:
■ Manual: measurement on demand.
■ BP (Blood Pressure) Averaging: see 11.9 BP Averaging.
■ Orthostatic BP measurement: see 11.10 Orthostatic BP Measurement.
In Continuous Monitoring mode, there are four NIBP measurement modes:
■ Manual: measurement on demand.
■ Auto: repeated measurement at set interval or an interval synchronized with the
real time clock.
■ STAT: continually rapid series of measurement over a five minute period.
■ Sequence: continually automatic measurement at set durations and intervals.
11.5 NIBP Display
Below is an example of NIBP screen in Spot Check mode:
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