Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n 343
Mainstream CO
2 monitoring
CO2 waveforms
The Cockpit also displays an instantaneous CO2
waveform.
A Expiratory or alveolar plateau (level of CO2 in
lungs ceases to increase significantly)
B End-tidal concentration point (end of expiratory
phase, where CO2 is measured)
C Onset of inspiratory phase
D Onset of expiratory phase
E Baseline during inspiration
Troubleshooting
In addition to evaluating the clinical status of a
patient, CO2 waveforms can help troubleshoot
problems with equipment.
The following table shows how CO2 waveforms can
be used to identify common problems.
349
Description Cause CO2 waveform
Alveolar plateau showing a
downward slope that
merges with a descending
limb.
– Inadequate seal around the
endotracheal tube
– Leaky or deflated endotracheal
or tracheostomy cuff
– Artificial airway that is too small
for the patient
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