Date of Award

7-12-1965

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Medical

First Advisor

Lyle Hamilton

Second Advisor

W.J. Stekiel

Third Advisor

James D. Horgan

Abstract

A recent review by Geddes and Hoff cites many attempts that have been made to correlate such things as muscular contraction, metabolism, blood flow, nervous activity, etc., with changes in electrical impedance of various parts and segments of the body such as tissues, organs, extremities, parts of the thorax, abdomen, neck, etc. Some of the impedance methods described in their review have fallen into disuse because of their unreliability and inherent problems associated with calibration and standardization. Other attempts to correlate impedance changes with physiological phenomena have been more successful, but because of their limited scope of application, they have been of interest only to those in very specialized fields of research and medicine.

One technique that has received some attention in recent years is based on the finding that changes in the electrical nature of the thorax, as reflected by impedance, are related to changes in the thoracic gas volume measured with a spirometer during normal breathing. Most studies dealing with the comparison between transthoracic impedance changes and breathing have been concerned with modifying and improving the sensing devices and altering the size, shape, position, means of application, and number of electrodes.

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