The heart rate at the end of surgery was significantly lower ( p < 0.05 ) , there were fewer hypotensive episodes ( p < 0.05 ) , the arterial and gastric intramucosal pH were higher ( p < 0.05 for both ) , the gastric intramucosal PCO2 was lower ( p < 0.05 ) , the intraoperative infused colloids and the total infused volume were lower ( p < 0.05 for both ) , and the postoperative time to flatus was shorter ( p < 0.05 ) in the GDT group than in the control group .