Influence from breathing pattern on alcohol and tracer gas expirograms--implications for alcolock use.

Abstract:

:Measurement of breath alcohol concentration is strongly influenced by timing and the breathing pattern. In particular, shallow expiration and hyperventilation leads to underestimation of the breath alcohol concentration. In the present study, expirograms of alcohol, water and carbon dioxide were recorded in 30 healthy individuals at various breathing manoeuvres (tidal volume, slow maximum and vital capacity expiration, breath holding, and hyperventilation). Estimation of the end expiratory alcohol concentration with the use of simultaneously measured carbon dioxide was shown to reverse the tendency of underestimation at shallow expiration and hyperventilation. These findings indicate that breath alcohol estimations can be performed at shorter expiration time and reduced expired volume compared to existing alcolocks. This is believed to improve their usability and to prevent a possible route for manipulation.

journal_name

Forensic Sci Int

authors

Kaisdotter Andersson A,Hök B,Ekström M,Hedenstierna G

doi

10.1016/j.forsciint.2010.06.016

subject

Has Abstract

pub_date

2011-03-20 00:00:00

pages

52-7

issue

1-3

eissn

0379-0738

issn

1872-6283

pii

S0379-0738(10)00313-0

journal_volume

206

pub_type

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