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Masimo
Chapter 6: Noninvasive Blood Pressure
(NIBP)
Operation - NIBP
Note:
This feature is optional on Rad-97 devices.
Rad-97 works by noninvasively monitoring the amplitude of cuff pressure changes during cuff
deflation to determine arterial blood pressure. The cuff pressure is first elevated above the
patient's systolic blood pressure level. The cuff will then begin to deflate at a certain rate. The
initial rise in the amplitude of pressure fluctuations during cuff deflation corresponds closely
to the systolic blood pressure. As the cuff is further deflated, the pressure fluctuations
increase in amplitude until a peak is reached which is usually referred to as the mean arterial
pressure (MAP). As cuff deflation continues, the diastolic pressure can be determined based
upon the rapidly diminishing amplitude of the pressure fluctuations.
Patient Category
The below table provides a method for selecting the appropriate Noninvasive Blood Pressure
(NIBP) patient category. To change patient category see
Chapter 5: Profiles
on page 103.
Weight
Patient Category Maximum Pressure
Greater than 75lbs (34kg)
Adult
280 mmHg
Between 15.4-75lbs (7-34kg) Pediatric
280 mmHg
Less than 15.4lbs (7kg)
Neonatal
140 mmHg
Patient Conditions
When measuring the patient's blood pressure, it is recommended that the patient be in
Normal Use position, as described below.
Ensure that the following conditions are met before taking the patient's blood pressure:
•
Patient is comfortably seated
•
Patient's legs are uncrossed
•
Patient's feet are flat on the floor
•
Patient's back and arms are supported
•
The middle of the cuff is at the level of the right atrium of the heart
CAUTION:
Blood pressure measurements can be affected by the patient's position,
physiological condition, and environmental factors.
