Effect of cytoprotective and antiulcer drugs on the healing process of subacute gastric ulcer in rat (a new model).

It has been developed by us a simple new method for producing subacute gastric ulcer in rats, combined with a novel method for the quantitative evaluation of the healing process. Fasted rats with 120-150 g were used. The animals were anaesthesized by ether and than a polyethylene chateter was orally inserted into the stomach with a fine needle inside. After the cannule reached the gastric wall, the needle was pressed gently so as to punch the gastric wall. Drugs under study were administered orally 30 min and 24 h after the puncture. Food and water were given ad libitum from 2 h after the intervention until the end (96 h) of experiments. In order to follow the healing process of subacute ulcer, the so-called tensile strength of the ulcer was determined by inflating and expressed in mmHg. The healing rate was calculated. The antiulcer drugs: Cimetidine, Famotidin, Pirenzepine and sucralfate dose dependently and significantly increased the healing rate of ulcer. Non steroidal antiinflammatory drugs: naproxen, piroxicam, indomethacin and ibuprofen significantly delayed the healing of ulcer. ASA showed tendency to delay the healing. Strong HCl (0.5 molar) significantly delayed the healing of ulcer. N-EM given subcutaneously dose dependently delayed the healing of subacute ulcer.