Detection of room air contamination of angiographic CO2 with use of a gas analyzer.
The purpose of this study was to describe a practical method to detect room air contamination in CO2 used for angiography. Samples of CO2 with known room air contamination levels were used in a "bag system" of CO2 delivery and sampled by a gas analyzer commonly used in anesthesia. Nitrogen levels were reliably detected indicating contamination with as little as 2% air. Oxygen levels were reliably detected, indicating contamination with as little as 5% air. Measured CO2 values were unreliable with higher-than-true values at all levels except 100%. All clinically important amounts of N2 and O2 contamination were readily detected by this practical method.
Department of Anesthesia, University of Texas Medical Branch, Galveston, Texas, USA. culpwilliamc@uams.edu
William C
WC
Culp
William C
WC
Culp
D000388:Air / Q000032:analysis*; D000792:Angiography / Q000379:methods*; D002245:Carbon Dioxide; D004867:Equipment Design; D006801:Humans; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000032:analysis; D013059:Spectrum Analysis, Raman; D018709:Statistics, Nonparametric
D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen