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6.5 Connecting the End Tidal CO
2
Sample Tube (Model 623xx)
ETCO
2
is measured with a sample tube using a nasal cannula adapted for sidestream CO
2
measurement.
Attach the cannula to the patient’s nose. Connect the sample tube to the watertrap and plug the watertrap
into the monitor. – The watertrap should be replaced after (6) hours of use and discarded in accordance
with the institution’s infection control policies for disposables. An alarm sounds if the watertrap becomes
full.
End Tidal CO
2
is collected through a sample tube
with a cannula adapted for nasal use, and a
watertrap. These items are supplied with the
monitor. CO
2
connectors are available from
medical supply vendors for direct connection to
ET tubes and LMAs.
Connecting the CO
2
airway -
• Place the cannula below the patient’s nose so
that the tubes enter the nostrils.
• Direct the tubing along both cheeks and over
the patient’s ears.
• Bring the tubing together beneath the patient’s
chin and slide the plastic ring up to the chin for
a snug and comfortable fit.
• Join the CO
2
watertrap to the sample line.
• Plug the watertrap into the front panel of the
monitor at the connector for CO
2
analysis. Be
sure to push it in until it is firmly seated.
Note: When ETCO
2
is displayed, the breath rate is
on the left and the CO
2
concentration is on the
right above the CO
2
waveform.
Watertrap – The watertrap should be replaced
after six (6) hours of use. The watertrap should be
discarded in accordance with the institution’s
infection control policies for disposables. If the
watertrap is full, an alarm will sound and a
message reading “Replace CO
2
watertrap” will
appear on the screen. The message “CO
2
watertrap occluded” may also appear. If this
happens, change the watertrap.
The watertrap should be handled as a biohazard
after use.
Correct placement of CO
2
nasal cannula