The comparison of the effects of bispectral index controlled minimal, low and high flow desfluran anesthesia on hemodynamics and recovery in patients undergoing lower abdominal surgery

Abstract

SUMMARYObjective: Low flow anesthesia is an inhalation anesthesia technique applied through a semiclosed rebreathing system in which the rate of rebreathing is at least 50%. When modern rebreathing systems are used, low anesthesia could be uttered if the speed of gas flow is decreased below 2 L/min. Method: In the present study, the comparison between minimal flow, low flow and high flow anesthesia practices of the effects of BIS controlled desfluran anesthesia on hemodynamic and costs has been aimed. Of the cases randomized divided into three groups within first 10 minutes after the anesthesia induction in all cases, in group Y, fresh gas flow in anesthesia maintenance was kept at 4.0 L/min; in group D, the flow speed was decreased to 1 L/min after the 10th minute; in group M, it was decreased to 0,5 L/min; anesthesia maintenance with desfluran ( 4-6%) was continued in all three groups. Results: In the comparison between the three groups received high, low and minimal flow, no significant differences had been noticed in heart rate, average arterial pressures, oxygen saturation and end-tidal carbon dioxide values in all three groups. The recovery was found to be earlier in low flow and minimal flow groups (p<0.05). Significant decrease in volatile anesthetic consumption and costs was observed in low flow and minimal flow groups (p<0.05). Conclusions: Low and high flow desfluran anesthesia application provided sufficient anesthesia depth, hemodynamic stability and respiration parameters during intraoperative period as well as had positive effects on postoperative recovery under sufficient conditions.