THORACIC CAGE IMPEDANCE MEASUREMENTS. DYNAMIC CHARACTERISTICS OF AN IMPEDANCE PNEUMOGRAPH,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1963
- Accession Number
- AD0430623
Entities
People
- Edwin Kinnen
- G. Turton
- William Kubicek
Organizations
- University of Minnesota