ELECTRICAL RESISTIVITY OF LUNG AT 100 KC./SEC.
Rept. for Oct-Dec 65.
ROCHESTER UNIV N Y DEPT OF ELECTRICAL ENGINEERING
Pagination or Media Count:
Average resistivity values of the lung were determined from measurements made on the surface of canine lung in vivo at 100 kc.sec. Data were taken at various levels of expiration with several different electrode configurations on each of 7 dogs. Theoretical considerations assumed the lung to be a homogeneous, isotropic, and primarily resistive medium at this frequency. The linear regression equation for resistivity as a function of lung air volume representing all data was calculated. The variation of resistivity values is characterized by a standard deviation of 180 ohm cm. for the distribution of individual experiment averages about the average of all data, at one-half expiration level. On the basis of assumptions relating normal and collapsed lung air volume, the resistivity of canine lung in situ can be expected to be around 1,800 ohm cm. at normal expiration. With inspiration, this value increases linearly by approximately 230 ohm cm. per 100 cc. Both of these values are expected to vary within 30 for an individual experiment, however. Comparison of the data taken with the various measurement technics on an individual animal indicated no discrepancy. Author
- Anatomy and Physiology