12-1
12 Monitoring NIBP
12.1 Introduction
The patient monitor uses the oscillometric method for measuring the non-invasive blood
pressure (NIBP). This measurement can be used for adults, pediatrics and neonates.
Automatic non-invasive blood pressure monitoring uses the oscillometric method of
measurement. To understand how this method works, we’ll compare it to the auscultative
method. With auscultation, the clinician listens to the blood pressure and determines the
systolic and diastolic pressures. The mean pressure can then be calculated with reference to
these pressures as long as the arterial pressure curve is normal.
Since the monitor cannot hear the blood pressure, it measures cuff pressure oscillation
amplitudes. Oscillations are caused by blood pressure pulses against the cuff. The oscillation
with the greatest amplitude is the mean pressure. This is the most accurate parameter
measured by the oscillometric method. Once the mean pressure is determined, the systolic
and diastolic pressures are calculated with reference to the mean.
Simply stated, auscultation measures systolic and diastolic pressures and the mean pressure is
calculated. The oscillometric method measures the mean pressure and determines the systolic
and diastolic pressures.
As specified by IEC 60601-2-30, NIBP measurement can be performed during
electro-surgery and discharge of defibrillator.
NIBP diagnostic significance must be decided by the doctor who performs the measurement.
NOTE
z Blood pressure measurements determined with this device are equivalent to those
obtained by a trained observer using the cuff/stethoscope auscultatory method or
an intra-arterial blood pressure measurement device, within the limits prescribed
by the American National Standard, Manual, electronic, or automated
sphygmomanometers.
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