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Inspired and end-tidal gas concentration and alveolar ventilation: concurrent breath-by-breath measurement
International Journal of Clinical Monitoring and Computing
|January 1, 1984
Abstract:
A system is described which concurrently measures, breath-by-breath, the inspired and end-tidal concentrations of five gases, and alveolar and total ventilation. Gas concentrations are measured by means of a quadrupole mass spectrometer and mixed-expired carbon-dioxide concentration, required for the computation of alveolar ventilation, is computed as the volume-weighted average of expired carbon dioxide.