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1 Journal of Applied Computer Science Methods

1 2011

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Fuzzy Techniques in the Functional Approximation of Volumetric Capnograms

Scandurra A. G., Pra Ana L. Dai, Passoni L. I., Meschino G. J., Clara F. M., Tusman G., Böhm S. H.

Journal of Applied Computer Science Methods

2011

Vol. 3 No. 1

17--29

The Volumetric Capnography (VC) is the plot of amounts of expired CO₂ within one tidal breath. The estimation of physiologic parameters derived from the VC is useful in the study of respiratory physiology, clinical anesthesia and critical care medicine. In this work we propose the use of a function based on a Takagi-Sugeno fuzzy model and a functional approximation based on the Levenberg-Marquardt algorithm to approximate the VC, with the goal to compute two variables of interest: the airway dead space (VDaw) and the slope of the so-called Phase III (SIII). These models presented a good performance in those capnograms that showed difficulties to be modeled with traditional medical analysis.