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Influence of the bicarbonate pool and on the occurrence of 13CO2 in exhaled air

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Summary

In 13C02 breath tests, based on 13C:12C ratio measurements, the appearance of 13C in exhaled C02 was monitored after the administration of a 13C-la-belled compound. Independently of the substrate used, the existence of a bicarbonate pool into which the C02 produced enters before being exhaled, imposes a delay on the appearance of changes in the 13C:12C ratio. To estimate the nature and magnitude of this delay, we applied a two-compartment model to describe the kinetics of the body bicarbonate pool and we evaluated the 13C:12C ratio of C02 entering that pool from the measured 13C:12C ratio in the exhaled C02 after an oral intake of “naturally labelled” 13C-glucose. Our results demonstrated that discrepancies between total and exogenous glucose oxidation in relation to the peak occurrence time, as well as the absolute quantities, could be adequately explained by the interference of the bicarbonate stores.

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Authors and Affiliations

  1. Department of Medical Physics, University of Patras, GR-261 10, Patras, Greece

    N. Pallikarakis & N. Sphiris

  2. Division of Diabetes, Institute of Medicine, University of Liege, B-4020, Liege, Belgium

    P. Lefebvre

Authors
  1. N. Pallikarakis
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  2. N. Sphiris
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  3. P. Lefebvre
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Pallikarakis, N., Sphiris, N. & Lefebvre, P. Influence of the bicarbonate pool and on the occurrence of 13CO2 in exhaled air. Eur J Appl Physiol 63, 179–183 (1991). https://doi.org/10.1007/BF00233844

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  • DOI: https://doi.org/10.1007/BF00233844

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