Abstract
To quantify the changes in optical properties of in vivo rat liver tissue, we applied diffuse reflectance spectroscopy (DRS) system using single-reflectance fiber probe during ischemia and reperfusion evoked by hepatic portal occlusion (hepatic artery, portal vein and bile duct). Changes in the reduced scattering coefficient μ s′, the absorption coefficient μ a, the tissue oxygen saturation StO2, and the oxidation of heme aa3 in cytochrome c oxidase (CcO) OHaa3 of in vivo rat liver (n = 6) were evaluated. Heme aa3 in CcO were significantly reduced (P < 0.05) during ischemia, which indicates a sign of mitochondrial energy failure induced by oxygen insufficiency of liver tissue. We found that OHaa3 obtained from the proposed method was unchanged immediately after the onset of ischemia and started gradually decreasing at 2 min after the onset of ischemia. Difference in the time course between OHaa3 and the conventional ratio metric analysis with μ a(605)/μ a(620) reported in literature demonstrates that the proposed method is effective in reduction of optical cross talk between hemoglobin and heme aa3. Our results suggest that DRS technique is applicable and useful for assessing in vivo tissue viability and hemodynamics in liver intraoperatively.
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Akter, S., Tanabe, T., Maejima, S. et al. In vivo estimation of optical properties of rat liver using single-reflectance fiber probe during ischemia and reperfusion. Opt Rev 23, 354–359 (2016). https://doi.org/10.1007/s10043-015-0171-9
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DOI: https://doi.org/10.1007/s10043-015-0171-9