Welch Allyn Propaq Quick Start Guide For Co2 Waveforms - Quick Reference Guide - Manual (Page 7)

Rebreathing CO
2
If the patient is rebreathing previously exhaled CO
2
, ETCO
2
values increase
and the baseline elevates. The waveform does not return to zero at the end of
inspiration. Look for:
• Inadequate expiratory time
• Malfunctioning inspiratory valve
• Other errors/malfunctions in breathing circuit
• Insufficient inspiratory flow rate
60
30
0
QG_CO2.frm Page 7 Friday, February 13, 2004 4:26 PM