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First Versus Second Portion of Expired Air and Duration of Breath Holding in the Sampling of Expired Air Carbon Monoxide
Author(s) -
BIGLAN ANTHONY,
MAGIS KRISTEN,
DIROCCO ARTHUR,
SILVERBLATT ALAN
Publication year - 1986
Publication title -
british journal of addiction
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.424
H-Index - 193
eISSN - 1360-0443
pISSN - 0952-0481
DOI - 10.1111/j.1360-0443.1986.tb00328.x
Subject(s) - expired air , medicine , significant difference , anesthesia
Summary Two experiments evaluated the importance of obtaining air samples from lower in the respiratory system in order to detect smokers. The first experiment with 102 adults indicated that end‐expired air samples were significantly higher in CO level than samples of the first portion of expired air. However, the ability to predict smokers from the two samples did not differ. Correlations between smoking measures and levels of CO from the two samples were virtually identical. Elimination of high‐rate smokers resulted in equivalent correlational and predictive outcomes. The second experiment was conducted with 104 adolescents. There was no difference in the detection of smoking using first versus second portion samples. Duration of breath holding was also examined as an independent variable. CO levels after 20 s of breath holding were significantly higher than those after 15 s. However accuracy in detecting smokers was not significantly affected by the duration of breath holding. Detection of smokers may not be improved through the use of more stringent sampling procedures and may prove unnecessary in research which uses CO to corroborate self‐report.