Computerized Measurement of Ventilation with Four Chest Wall Magnetometers (Magnetometer Measurement of Ventilation).
Abstract
This study describes a model of chest wall movement which assumes that the rib cage and abdomen behave like elliptical cylinders with freedom of movement laterally as well as in the anteroposterior (A-P) dimension. Using this model a computerized method of measuring ventilation from magnetometers placed A-P and laterally on the rib cage and abdomen is described. Calibration is performed on normal breaths, avoiding the (isovolume maneuver) required in most previous techniques. With this technique we confirm that the rib cage contributes the majority (74%) of the volume change in the upright position. The method is relatively insensitive to changes in body position and respiratory loading unless major changes in end-expiratory chest wall dimensions are produced.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1978
- Accession Number
- ADA060473
Entities
People
- C. H. Robertson Jr.
- L. D. Homer
- L. M. Fraser
- M. E. Bradley
Organizations
- Naval Medical Research Center