Traditional Versus Goal Directed Perioperative Fluid Therapy in High Risk Patients

Sin intervención: Control

Standard monitoring. Initial optimization of fluid status is performed by pulse, BP and anaesthesiologist assessment with Ringer acetate. Followed by an infusion of 10ml/kg/t Ringer acetate. Urinary output and blood pressure is used as a surrogate parameter: the infusion rate is increased by a fall in blood pressure or urine output <0.5ml/kg/t. Bleeding replaced with HES 1:1, otherwise see table for fluid therapy page 9. Vasoactive agents (noradrenaline / phenylephrine) is given if the anesthesiologist considers this necessary. Postoperative give 1000ml Glucose 5%. HES or Ringer when low blood pressure, eventually noradrenaline as vasoactive agent.

Experimental: Goal directed fluid therapy

Procedimiento: Goal directed fluid therapy guided by LiDCOrapid

Standard monitoring. The patient is connected to the LiDCOrapid monitor via an arterial line placed in a.radialis. A bolus of 500 ml Ringer acetate is given before anesthesia. If the stroke volume (SV) increases more than 10%, repeat the procedure until the SV is not increasing. After that, induction of anesthesia.

Maintenance fluid is given as Ringer acetate 2ml/kg/t. Continuous monitoring of stroke volume variation (SVV). If SVV> 10%, give a fluid bolus 6ml/kg Ringer acetate. Repeat until SVV <10%. Bleeding is being replaced 1:1 with hydroxyethyl starch. SAG by bleeding >1000ml. By fall in blood pressure and SVV <10%, start vasoactive treatment with epinephrine. Postoperative is given Glucose 5% 80ml/h.

Postoperative complications

Length of hospital stay

Complications until discharge and readmission within 30 days

Mortality within 30 days and 3-month after surgery

Renal function

defined by RIFLE criteria

Vasoactive agents need

Difference in the number of patients in need of vasoactive agents, during surgery and in the postoperative period.