SUMMARY CHANGES IN GASTRIC FLUID VOLUME AMD pH IN UNPREMEDICATED AND RANITIDIN-PREMEDICATED PATIENTS In this study, the effects of 300 mg p.o preoperative Rani¬tidine on pH and volume of gastric fluid were inwestigated in 10 adult patients and results were compared with 10 adult unpremedicated patients. Intragastrik fluid was aspirated at induction, intraoperative, pre-extubation and post¬operative periods. Volumes pH values ' of aspirates were measured. Compared to unpremedicated group, gastrik fluid volume decreased and pH increased significantly (p