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Pulmonary 15NO uptake in Man

  • Respiratory System
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Abstract

Nitric oxide (NO) is commonly thought to reveal more precise values of pulmonary gas uptake through alveolar-capillary membranes (DL) than the normally used carbon monoxide (CO). Since such measurements are influenced by a significant endogenous NO delivery within human airways, we propose the use of the naturally occurring 15N-labelled stable nitric oxide isotope 15NO. It occurs with a relative abundance of 0.37% of the dominating isotope 14NO. Therefore, the endogenous 15NO production can be neglected. In the present pilot study we demonstrate the workability of 15NO in determining DL in healthy individuals. In seven female and 15 male volunteers, averaged values of DL increase with increasing mean alveolar volume as well as individual body height (P=0.000001). Due to the very high significance level obtained from the multiple regression analysis, we conclude that the application of 15NO establishes a novel approach to calculate standard values of DL. Such calculations can be employed to predict a reference for patients who suffer from pulmonary diffusion limitation.

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Acknowledgements

This work was supported by grants from Lothar Neumann (Erich Jaeger, Hoechberg, Germany) and the Deutsche Forschungsgemeinschaft (DFG). The authors thank Professor Dr. F.X. Kleber (Unfallkrankenhaus Berlin, Germany) for financing the ethanol-cooling system.

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Correspondence to H. Heller.

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Heller, H., Gäbler, R., Brandt, S. et al. Pulmonary 15NO uptake in Man. Pflugers Arch - Eur J Physiol 446, 256–260 (2003). https://doi.org/10.1007/s00424-003-1014-2

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  • DOI: https://doi.org/10.1007/s00424-003-1014-2

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