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Chapter 13: GAS Monitoring (Mainstream)
is needed to prevent movement (motor response) in 50% of subjects in response to surgical
(pain) stimulus.
The MAC value may be calculated and displayed by using end-tidal (ET) gas concentrations
according to the following formula:
MAC = %ET(AA
)/X(AA
1
X(AA): HAL=0.75%, ENF=1.7%, ISO=1.15%, SEV=2.05%, DES=6.0%
NOTE:
The patient age as well as other individual factors is not taken into account in the
above described formula. ET gas concentrations for secondary agent (AA2) is only
available for IRMA AX+/OR+ probes.
Airway adapter:
The IRMA Airway Adapter is inserted between the endotracheal tube and the Y-piece of the
breathing circuit. The respiratory gas measurements are obtained through the XTP™ windows in
the sides of the adapter. The XTP windows are transparent to light in the wavelength ranges of
interest and they are specially designed using the latest advances in material technology to
provide a window minimizing the impact of water vapor on light transmission.
The IRMA airway adapter is designed as a non-sterile single patient use disposable for both
Adult/Pediatric and Infant applications. The IRMA Infant airway adapter has specially designed
connectors for minimizing the dead space and can be used even for very small patients.
IRMA airway adapters: Adult/ Pediatric and infant
Warning
) + %ET(AA
)/X(AA
1
2
13-4
) + %ET(N2O)/100
2
User Manual
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