NIBP Monitoring
13-6
13.3 Measurement Limitations
Non-invasive blood pressure measurement uses the oscillometric method of
measurement. The monitor detects the regular arterial pressure pulse. In some
circumstances when the patient's condition makes it difficult to detect this pulse, the
measurement becomes unreliable and the measurement time increases. You should
be aware that the following conditions could interfere with the measurement, make
the measurement unreliable, prolong the measurement, or even make a measurement
impossible.
îš„ Patient Movement
E.g.The patient is moving, shivering, or having convulsions.
 Cardiac Arrhythmia’s
E.g.The patient's cardiac arrhythmia has caused an irregular heartbeat.
îš„ Heart-lung Machine
E.g. Measurements will be impossible if the patient is connected to a heart-lung
machine.
îš„ Pressure Changes
E.g.The patient's blood pressure is changing rapidly over the period of time during
which the arterial pressure pulses are being analyzed to obtain the measurement.
îš„ Severe Shock
E.g.If the patient is in severe shock or hypothermia, reduced blood flow to the
peripheries will cause reduced pulsation of the arteries.
îš„ Heart Rate Extremes
The monitor is unable to perform pressure measurements at a heart rate of less than
40 bpm and greater than 240 bpm.
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