10 Monitoring NBP
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Temporary Loss of Function: The pressurization of the cuff can temporarily cause loss of function
of monitoring equipment used simultaneously on the same limb.
CAUTION
If you spill liquid onto the equipment or accessories, particularly if there is a chance that it can get
inside the tubing or the measurement device, contact your service personnel.
Measurement Limitations
NBP readings can be affected by the position of the patient, their physiological condition, the
measurement site, and physical exercise. Thus a physician must determine the clinical significance of
the NBP information.
Measurements are impossible with heart rate extremes of less than 40 bpm or greater than 300 bpm, or
if the patient is on a heart-lung machine.
The measurement may be inaccurate or impossible:
• with excessive and continuous patient movement such as shivering or convulsions
• if a regular arterial pressure pulse is hard to detect with cardiac arrhythmias
• with rapid blood pressure changes
• with severe shock or hypothermia that reduces blood flow to the peripheries
• with obesity, where a thick layer of fat surrounding a limb dampens the oscillations coming from
the artery
• on an edematous extremity.
The effectiveness of this sphygmomanometer has not been established in pregnant, including
pre-eclamptic patients.
When the accelerated measurement is used the minimum number of oscillations per deflation step
is 1, instead of the 2 in the standard measurement. This allows a faster measurement result but requires
that the patient keeps the limb in question still. The accelerated measurement is recommended for use
when very few or no artifacts are expected, for example with sedated patients.
You can see whether the accelerated measurement is in use by looking in the
Setup NBP menu. The
Accelerated Msmt setting shows whether the accelerated measurement is Off, on for Manual
measurements or on for
All measurements. This setting is view-only in Monitoring Mode and can be
changed in Configuration Mode. When the accelerated measurement is in use, no pulse rate is derived
from NBP.
Measurement Modes
There are four modes for measuring NBP:
•
Manual - measurement on demand.
•
Auto - continually repeated measurements (between one minute and 24 hours adjustable interval).
•
Sequence - up to four measurement cycles which will run consecutively, with number of
measurements and interval between them configurable for each cycle.
•
STAT - rapid series of measurements over a five minute period, then the monitor returns to the
previous mode. Use only on supervised patients.
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