Page 13-2 Infinity Gamma Series VF4
Overview
The Infinity Gamma Series monitor measures concentrations of
end-tidal CO
2
(etCO
2
) when this option is enabled and the etCO
2
pod or a Scio multigas module is connected to your monitor.
(Ordering information about these options is available from your
Dräger representative.) The etCO
2
pod can perform mainstream
measurements in all monitoring modes and sidestream measure-
ments in the adult and pediatric monitoring modes. The Scio mul-
tigas module can perform sidestream measurements in the adult
and pediatric monitoring modes.
NOTE: This chapter describes etCO
2
monitoring with the etCO
2
pod. For information about monitoring with the Scio multigas mod-
ule, see the chapter Multigas.
The etCO
2
pod acquires signals from a CAPNOSTAT
®
sensor. For
mainstream measurements, the Capnostat fits over an adapter
inserted into the patient’s airway. For sidestream measurements,
the Capnostat fits on the nasal sampling cannula tubing.
The Capnostat analyzes the patient’s expired and inspired air by
sending a beam of infrared light through transparent ports in the
adapter and detecting changes in the CO
2
absorption levels. The
etCO
2
pod processes this data and derives values for the follow-
ing parameters:
! Instantaneous CO
2
— The instantaneous value of the CO
2
level. Displayed on the monitor as a waveform (or capno-
gram) depicting the variation in airway CO
2
levels during a
patient’s respiration cycle.
! End-tidal CO
2
(etCO
2
) — The level of CO
2
in the airway at
the end of expiration. If you specify one breath as the averag-
ing interval, the monitor reports the CO
2
level at the end-
expiration point of each breath. If you specify a particular
averaging interval (10 or 20 seconds), the monitor reports the
maximum value measured during this interval. The current
value for etCO
2
is displayed in the etCO
2
parameter box.
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