Supplement – Infinity
®
Delta Series Software VF10.1 57
Supplement for Infinity Delta Series Software
The age-corrected MAC values are calculated using an equation developed by W. W. Mapleson (British
Journal of Anaesthesia 1996, pp. 179-185). The equation applies to patients older than 1 year.
The Delta series monitor allows the user to select whether Standard, Age-Corrected, or no xMAC
calculation is provided. The xMAC calculation is automatically adjusted according to the ambient pressure
measured by the gas analyzer. The influence of other drugs (opiates or intravenous hypnotics) is not
considered in the xMAC calculation.
Standard xMAC Calculation
When calculating the Standard xMAC for gas mixtures, the respective multiples for N
2O and anesthetic
agents are added according to the following equation:
The xMAC standard calculation assumes a patient age of 40.
Standard xMAC example:
exp. conc. Anesth1 = etIso = 0.65 Vol%
exp. conc. N2O = etN2O = 69 Vol%
NOTE
These values are guiding values only. The binding
values are specified on the package information
leaflet of the anesthetic agent.
NOTE
The xMAC Calc. selection in the Agent menu determines whether standard, age-corrected, or no xMAC
values are used.
NOTE
When connecting to a Dräger SCIO module or to a device using a protocol other than MEDIBUS.X:
– If Delta receives two anesthetic agents, xMAC displays locally only; it is not available on the network
for remote view or storage.
– If Delta receives one anesthetic agent, xMAC displays locally and is also available on the network
for remote view and storage, except that at ICS the xMAC value is shown without the label and in
Bed View only.
Connection to Dräger devices using MEDIBUS.X protocol does not have these limitations; xMAC from
those devices is available on the network and displays correctly, including at ICS Bed View and Main
Screen.
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