BIOL 320 Lecture Notes - Lecture 8: Lung Volumes, Spirometer, Spirometry
14 Jan 2017
School
Department
Course
Professor
Document Summary
Method of choice for a fast and reliable screening of patients suspected of having copd. Detects pressure changes across a membrane of a known resistance. Analyze a recording to derive respiratory parameters. Provides the alveoli with fresh atmospheric air. Removes stale air, which has reduced oxygen and increased carbon dioxide concentrations. Many important aspects of lung function can be determined by: The level of a floating bell tank gave a measure of changes in lung volume. Flow was calculated from the slope of the volume. Device used in our powerlab that measures airflow directly. The difference in pressure either side of a mesh membrane with a known resistance. A small pressure difference proportional to flow rate. The pressure signal into a changing voltage that is recorded by the powerlab. Adding successive sampled values of the flow signal and scaling the sum appropriately.
