Between May @ and November @ , patients undergoing pancreaticoduodenectomy were enrolled in an institutional review board-approved , single-center , prospective , parallel , randomized controlled trial ( NCT @ ) , comparing lactated Ringers ( LAR ) ( @ mL/kg/hr LAR intraoperation , @ mL/kg/hr LAR postoperation ) with HYS ( @ mL/kg/hr LAR and @ mL/kg/hr HYS intraoperation , @ mL/kg/hr HYS postoperation ) .