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The influence of obstructive jaundice on the gastric mucosal barrier was studied before and after ligation of the common bile duct using 21 mongrel dogs with a Heidenhain pouch. The gastric mucosal barrier was examined using gastric mucosal permeability of ionic net fluxes of Na+ and H+ (delta Na+, delta H+), and transmucosal electrical potential difference (PD) during the irrigation of the pouch with various test solutions. No significant differences in delta Na+ or delta H+ during the irrigation with 100 mN HCl were found between before and after obstructive jaundice. Almost the same results were observed during the irrigation with 150 mN HCl. Obvious increases in delta Na+ and delta H+ were found, when 20 mM sodium taurocholate (taurocholate) was used in addition to 100 mN HCl. No differences were, however, found between before and after obstructive jaundice. The PD during the irrigation with 100 and 150 mN HCl showed about the same levels of -50 mV. The PD decreased early during the irrigation with 20 mM taurocholate in addition to 100 mN HCl, but no differences were found in these values between before and after obstructive jaundice. Dose-response relationships were found between the concentration of taurocholate in addition to 100 mN HCl, and delta Na+, delta H+ and sigma PD/15 min, while no differences in ED50 of taurocholate for delta Na+, delta H+ or sigma PD/15 min were observed between before and after obstructive jaundice. These results suggest that obstructive jaundice itself exerts no influence on the gastric mucosal barrier with respect to gastric mucosal permeability and PD in dogs.

Influence of obstructive jaundice on gastric mucosal barrier in dogs.