title: Computerized hot-wire anemometry--principles of calculation.
abstract: Principles of calculation of respiratory parameters based on a hot-wire anemometer with special reference to computer monitoring were evaluated. Flow-rate, gas-pressure, and flow-direction signals were recorded simultaneously on magnetic tape. Subsequent quantitative analyses were performed on a general purpose digital minicomputer. An analysis epoch of 256 s was selected from the 3 channels. After identification of one cycle baseline values of flow-rate and pressure were determined. Different time-lags in one respiratory cycle (inspiratory time, pause time and expiratory time) could be determined. Inspiratory and expiratory volumes were obtained by integration. Peak of the thoracic cage and the lungs were calculated using the above mentioned parameters. Finally, the respiratory frequency was calculated.
mesh_terms: D000403:Airway Resistance; D003201:Computers; D005740:Gases; D006801:Humans; D008170:Lung Compliance; D008176:Lung Volume Measurements; D008991:Monitoring, Physiologic / Q000379:methods*; D011312:Pressure; D012119:Respiration; D012129:Respiratory Function Tests / Q000379:methods*; D013147:Spirometry
chemical_list: D005740:Gases