<qa>  What is the acetate solution used to treat a patient?Forty patients will be randomly allocated into two equal groups as Group D Dexmedetomidine group and Group P Placebo group using computer generated random numbers. After arrival in the operating room, ondansetron 0.15 mgkg intravenous IV will be given as a pre-medication. Ringers acetate solution 500 ml will be infused as a preload then at a rate of 6-8 mlkgh during surgery for supplying maintenance and deficit. Monitoring consisted of continuous electrocardiogram EKG, non-invasive blood pressure NIBP, pulse oximetry SpO2, CO2 expired fraction ETCO2, desflurane inspired fraction FIdes, and desflurane expired fraction ETdes Infinity Kappa, Dräger, Lübeck, Germany will be attached to the patient. BIS module InfinityR BISxTM SmartPodR, smoothing rate: 15 or 30 seconds, software revision: VF5 will also be attached for detection of consciousness level. 