Measurement Limitations Monitoring NIBP
6 - 4 BP10 Operator’s Manual
6.3 Measurement Limitations
Measurements are 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:
■ If a regular arterial pressure pulse is hard to detect.
■ With excessive and continuous patient movement such as shivering or
convulsions.
■ With cardiac arrhythmias.
■ Rapid blood pressure changes.
■ Severe shock or hypothermia that reduces blood flow to the peripheries.
• The effectiveness of this sphygmomanometer has not been established in
pregnant, including pre-eclamptic patients.
6.4 Measuring NIBP
6.4.1 Preparing the Patient
In order to minimize the NIBP measurement errors, whenever possible make sure the
patient is in the following positions.
■ Comfortably seated
■ Legs uncrossed
■ Feet flat on the floor
■ Back and arm supported
■ Middle of the cuff at the level of the right atrium of the heart
• It is recommended that the patient relaxes as much as possible and keep
calm before performing measurement and that the patient does not talk
during NIBP measurement.
• It is recommended that 5 minutes should elapse before the first
measurement is taken.
• The operator should not touch the cuff or tubing during NIBP measurement.
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