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