Effect of hepatic blood oxygenation on bile secretion in rats.

The effect of hepatic hemodynamics and hepatic tissue blood oxygenation on bile flow was studied in anesthetized rats by reflectance spectrophotometry. The hepatic hemodynamics and blood oxygenation were assessed by reflectance spectrophotometry. The hepatic ischemia was induced by partial ligation of portal vein and hepatic hypoxia was induced by inhalation of low concentration of oxygen. 1. The ischemia decreased hepatic blood volume index and hepatic blood oxygenation, and diminished bile flow. 2. Respiratory hypoxia suppressed hepatic oxygenation with minimal change of hepatic blood volume, and it also reduced the bile flow. 3. Bile flow was related hyperbolically with hepatic oxygenation and its dependency in hepatic ischemia and respiratory hepatic blood hypoxia identical. It is concluded that the hepatic tissue blood oxygenation affects hepatic energy metabolism, thus affecting the bile secretion.