GE CARESCAPE, User Manual

Page: 347 / 548

Gas exchange
●
Correct positioning of the sampling setup in the patient circuit.
￭
Straight Y-piece (physical dead space < 8 ml).
￭
If a heat and moisture exchanger (HME) or an HME with filter (HMEF) is used,
place it between the D-lite(+)/Pedi-lite(+) sensor and the patient.
￭
Use the D-lite+ sensor for continuous monitoring. Condensed water inside the
D-lite may distort the volume readings.
￭
Use a pediatric Pedi-lite or Pedi-lite+ sensor for pediatric patients (tidal volumes
15 ml to 300 ml) and remember to select the correct sensor type in the monitor
menu.
●
Ventilator function.
￭
Check the circuit for any leaks as they may cause inaccurate volume
measurement.
￭
Use of by-pass flow may result in inaccurate volume measurement.
￭
Max. 85% FiO
2
can be used, higher reading will increase the sensitivity of the
Haldane transformation to error.
Gas exchange troubleshooting
Problem Solution
Gas exchange values are too low.
●
Check the sampling line and connectors for
leakage.
Gas exchange values seem unreliable.
●
Check the ventilation mode.
●
Check the inspired oxygen concentration and
correct if necessary (max. 85%).
●
If the expiration gas flow during the end phase of
the patient’s expiration is close to zero for more
than two seconds before the next inspiration
starts, the ventilator’s bypass flow may affect
the measurement. You can reduce this effect by
adding a suitable spacer with a 5 to 10 ml dead
space (e.g., a straight T-adapter) between the
Y-piece and the D-lite or the Pedi-lite adapter.
Module does not work.
●
Check and clean the filter if necessary.
●
Check the water trap. If it was too full, liquid may
have entered the module. Replace the module and
have it checked by authorized service personnel.
No gas exchange values.
●
Check that the gas sampling line is not connected
to the sample gas out connector.
VO
2
values are non-physiologic.
●
Verify that the oxygram curve is stable.
●
Change the sampling line.
●
Check the D-lite placement.
Are gas exchange values accurate with 100%
oxygen? No, gas exchange measurements are not possible
when the FiO
2
> 85%. This is also indicated on screen
by the replacement of numbers by ---. Please also
note that full measurement accuracy is obtained
when FiO
2
is less than 65%. Between 65% and 85%
FiO
2
, the accuracy is reduced to +/-15%
2062971-001 CARESCAPE Modular Monitors 347