By Anton Amann, David Smith

This booklet describes how the research of the hint gases in exhaled breath can be utilized for non-invasive scientific analysis of sickness and for tracking the effectiveness of remedy. This process deals a tremendous addition to the diagnostic options to be had to medication, having the virtue that online breath research supplies info to the clinician instantly and hence facilitate speedy prognosis and therapy. The publication is a compilation of contributions to a convention held in Dornbirn, Austria, 23-26 September 2004 on quite a few elements of this new subject. Written via the most important staff within the box, it's going to supply clinicians and others within the clinical fraternity with an updated precis of the prestige of the topic. The broad scope of the chapters levels from descriptions of the analytical tools which are on hand, by using breath research within the research of physiological phenomena, to the identity of biomarkers of specific harm and affliction.

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24>38,39 This has led to the development of a refined analytical procedure that accounts for the presence of water ~ a p o u and r ~ ~which, very significantly, also provides a measurement of the humidity of the sample, as mentioned p r e v i ~ u s l This study has shown that when the overall ion chemistry and the kinetics are understood and properly accounted for, the quantification of trace gases in humid air and exhaled breath is not distorted by the water vapour in the sample ( i e . the quantification is not dependent on the humidity of the sample).

Med Biol Eng Comput 1996; 34: 409-419. 6. Adams N, Smith D. The selected ion flow tube (SIFT): a technique for studying thermal energy ion-neutral reactions. Int J Mass Spectrom Ion Physics 1976; 21: 349-359. 7. Smith D, Adams N. The selected ion flow tube (SIFT): studies of ion-neutral reactions. Adv A t o m Mol Phys 1987; 24: 1-49. 8. Smith D. The ion chemistry of interstellar clouds. Chemical Reviews 1992; 92: 1473-1485. 9. Smith D, Spanel P. Ions in the terrestrial atmosphere and in interstellar clouds.

45 4. Summary, Some Concluding Remarks and Future Prospects for SIFT-MS We have described the unique features of selected ion flow tube mass spectrometry, SIFT-MS, for accurate, real-time analysis of trace gases in air, exhaled breath and liquid headspace. Sample collection into bags or onto traps, which can compromise the sample, is unnecessary. This new analytical method can be used to detect most gases in dry or moist air down to parts per billion levels in times of seconds, including most permanent gases and the vapours of organic liquids and solids.

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