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http://dx.doi.org/10.5369/JSST.2011.20.2.71

Bioimpedance Changes in Rats with CCl4-Induced Liver Fibrosis  

Heo, Jeong (Department of Internal Medicine, Medical School, Pusan National University)
Jung, Dong-Keun (Department of Medical Engineering, College of Medicine, Dong-A University)
Publication Information
Journal of Sensor Science and Technology / v.20, no.2, 2011 , pp. 71-76 More about this Journal
Abstract
To characterize the relationship between the stage of hepatic fibrosis and bioimpedance, several electric parameters were estimated in rats with $CCl_4$-induced liver fibrosis. Thirty three Sprague-Dawley rats were intraperitoneally injected with a $CCl_4$-mineral oil mixture (1:1, 0.2 mL/100 g) twice a week for 8 weeks. The resistance(R), reactance(X), impedance(Z), and dissipation factor(D) between 1 kHz and 100 kHz were then evaluated in the livers of the rats under pentobarbital anesthesia using an HP4294A Impedance Analyzer. The rats were killed 2, 4, 6, and 8 weeks later, and their livers were classified in accordance with Ishak's scoring system. R, X, and Z changed in accordance with the progression of hepatic fibrosis and the changes were greater at lower frequencies than at higher frequencies. In comparison, the D spectrum was biphasic; D increased initially then decreased with increasing frequency. All of the parameters(R, X, Z, and D) changed in accordance with the stage of fibrosis in the livers, but D changed specifically with the progression of fibrosis. These results indicate that hepatic fibrosis may be evaluated by determining the changes in D.
Keywords
Bioimpedance; Dissipation factor; Hepatic fibrosis stage; Rat liver;
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