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A real-time algorithm to improve the response time of a clinical multigas analyser
L Wong1, R Hamilton, E Palayiwa
1Nuffield Department of Anaesthetics, University of Oxford, Radcliffe Infirmary, UK.
Objective:
An algorithm to improve the response time of a clinical respiratory multigas analyser is presented.
Methods:
The algorithm involves the application of a second order differential equation to the analyser gas output signals in real-time. The adjusted analyser output signals are compared with those of a quadrupole respiratory mass spectrometer sampling and analysing simultaneously.
Results:
Our results show a close correlation between the adjusted clinical gas analyser and the mass spectrometer signals. Lung volumes derived from a non-invasive sinusoidal inert gas forcing technique, in a model test lung, using the adjusted clinical gas analyser and the mass spectrometer signals demonstrated comparable results.
Conclusions:
The algorithm provides an improvement on the relatively slow response times of the clinical gas analyser for breath-by-breath time-dependent applications. The same algorithm can also be applied to other instruments which have slow response times.