Measurement of airway calibre

A - Human Necessities – 61 – B

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A61B 5/087 (2006.01) A61B 5/085 (2006.01)

Patent

CA 2201042

The variation in flow resistance of the respiratory system (Rrs) is determined as an indicator of variations in airway calibre, by oscillating the system, for example at 6 Hz for 5-15 minutes and determining the variations in ratio of the pressure difference (Prs) across the system that is in phase with flow, to flow ~. The variation in airway calibre may be employed as a prognostic indicator in asthmatics and also to assess the efficacy of treatment.

La variation dans la résistance au débit d'air de l'appareil respiratoire (Rrs) est établie en tant qu'indicateur des variations dans le calibre des voies aériennes, en faisant osciller l'appareil, par exemple à 6 Hz pendant 5 à 15 minutes, et en déterminant les variations dans le ratio entre la différence de pression (Prs) dans l'ensemble de l'appareil qui est en phase de débit, avec le débit~. La variation dans le calibre des voies aériennes peut être utilisée comme indicateur pronostique chez les asthmatiques ainsi que pour évaluer l'efficacité du traitement.

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