Influence of Preoperative Oral Rehydration Therapy on Circulation Stability during Anesthesia Induction

Patients scheduled to undergo colon surgery were randomly assigned to an oral rehydration therapy（ORT）group or a conventional group. In an ORT group, patients consumed maximum 1,000 mL of OS-1 until 2 hours before induction of anesthesia. Before induction of anesthesia, a catheter connected to a Vigileo monitor was placed in the radial artery of all patients. We then measured heart rate, blood pressure, arterial pressure-based cardiac output, cardiac index, stroke volume variation（SVV）for hemodynamic parameters and the amount of fluids patients consumed preoperatively. Results showed that the amount of drinking fluid volume was significantly greater and the number of patients who required a vasopressor and colloids was significantly lower in the ORT group than in the conventional group. Although blood pressures and heart rates remained unchanged after anesthesia induction in the ORT group, SVV in both groups was significantly higher than at baseline, which might predict fluid responsiveness.