GE CARESCAPE, User Manual

Page: 253 / 548

Invasive pressures
Problem Solution
The measurement values in the SPV and PPV
parameter window are not displayed.
●
Ensure that there are no arrhythmias present.
●
Check that the correct arterial site has been
selected as the SPV source.
●
If you are using the SPV measurement in the NICU
software package, only manual measurement is
shown.
●
The algorithm requires at least three pulse beats
per each respiration cycle and when this is not
true, the values are not shown. Try using manual
measurement.
Why are displayed pressure values different than
expected?
●
Check the patient. Values could be valid, the
patient could be lying on the tubing, or the tubing
could be kinked.
●
Check tubing for bubbles.
●
Remove excess tubing.
●
Check phlebostatic axis placement of transducer.
●
Rezero pressure.
●
If patient is on IABP, verify that the monitor’s IABP
program is turned on. If necessary, turn it on.
Why are the arterial, non-invasive (oscillometric),
and auscultated blood pressure readings indicating
different values? The three measurement methods use different
technologies. Auscultation and oscillometric are
both indirect methods of measuring blood pressure.
In auscultation, changes in arterial sounds during
cuff deflation are related to systolic and diastolic
pressure. With oscillometric measurement, changes
in measured pressure oscillations during cuff
deflation are related to systolic, mean and diastolic
pressures. Changes in the vascular tone of the
arterial system can cause these two indirect methods
to differ from one another and from direct arterial
pressure measurements.
Invasive arterial blood pressure is a direct method
of measuring blood pressure. Differences between
direct and indirect blood pressure measurements are
expected. These differences occur because direct
methods measure pressure and indirect methods
measure flow. In addition, differences occur because
the measurement location is not the same (e.g.,
brachial artery for NIBP vs. radial artery for invasive
arterial pressure monitoring).
2062971-001 CARESCAPE Modular Monitors 253