Mindray Accutorr 7, Operator'S Manual

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Accutorr 7 Operator’s Manual 11 - 1
11
Monitoring CO
2
11.1 Overview
CO
2
monitoring is a continuous, non-invasive technique for determining the
concentration of CO
2
in the patient’s airway by measuring the absorption of infrared (IR)
light of specific wavelengths. CO
2
has its own absorption characteristic and the amount
of light passing through the gas probe depends on the concentration of the measured
CO
2
. When a specific band of IR light passes through respiratory gas samples, some of
the IR light will be absorbed by the CO
2
molecules. The amount of IR light transmitted
after it has been passed through the respiratory gas sample is measured with a
photodetector. From the amount of IR light measured, the concentration of CO
2
is
calculated.
The CO
2
measurement is used to monitor the patient’s respiratory status.
CO
2
monitoring is intended for adult, pediatric and neonatal patients.
11.2 Safety
WARNING
•
Remove the airway sampling line from the patient’s airway while nebulized
medications are being delivered.
•
Leakage in the breathing or sampling system may cause the displayed EtCO
2
values to be significantly low. Always make sure that all components are
securely connected.
•
EtCO
2
values measured from the CO
2
module may differ from those of from
the blood gas analysis.
•
Route all tubing away from the patient’s throat to avoid strangulation.
•
Inspect the airway for a tight connection and make proper settings before
attaching it to the patient.
•
Squeezing or bending the sampling line during the CO
2
measurement may
cause inaccurate CO
2
readings or no reading.