Fluid TherapyIsotonic SolutionsColloidsPerioperative CareSurgical Procedures, OperativeIntraoperative CareRehydration SolutionsHyponatremiaPlasma SubstitutesHypovolemiaColorectal SurgeryWater-Electrolyte BalanceBlood Volume DeterminationPostoperative ComplicationsGoalsHydroxyethyl Starch DerivativesPostoperative CareProspective StudiesSodium ChlorideSurgery Department, HospitalTreatment OutcomeHemodynamicsPreoperative CareCardiac Surgical ProceduresSurgical Procedures, ElectiveCritical IllnessGeneral SurgeryParenteral Nutrition, TotalIntensive CareIntensive Care UnitsPerioperative PeriodAbdomenLength of StayPostoperative PeriodParenteral NutritionSurgical Wound InfectionAnesthesia, GeneralMonitoring, IntraoperativeAnesthesia