Passport 12/Passport 8 Operator’s Manual 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 80601-2-30, 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
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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