Accession Number : AD0430623


Title :   THORACIC CAGE IMPEDANCE MEASUREMENTS. DYNAMIC CHARACTERISTICS OF AN IMPEDANCE PNEUMOGRAPH,


Corporate Author : MINNESOTA UNIV MINNEAPOLIS


Personal Author(s) : Kinnen,Edwin ; Kubicek,William ; Turton,G


Report Date : Dec 1963


Pagination or Media Count : 9


Abstract : An accurate calibration of an impedance pneumograph is complicated by two factors--tissue movement throughout the thorax during respiration and the mode of inspiration. In either case, the result is a variation in transthoracic electrical impedance which is not related to inspired air volume. It was found that the change of thoracic impedance as a function of inspired air volume for normal repeated inspirations had a variation of 50% at the 0.2-liter level of inspiration, decreasing to 10% at the 2-liter level. A significantly greater percent variation was noted for changes in the mode of subjects' breathing and between subjects. (Author)


Descriptors :   *RESPIRATION , TISSUES(BIOLOGY) , THORAX , PHYSIOLOGY , MEASUREMENT , MOTION , MEDICAL EQUIPMENT , AIR , VOLUME


Distribution Statement : APPROVED FOR PUBLIC RELEASE