A study to evaluate the effect of pain relief given before surgery on the requirement of anaesthetic gases during keyhole gall bladder removal surgery

INTERVENTION: Intervention1: PARACETAMOL 1gm, IV MAGNESIUM SULPHATE 30 mg per kg ,IV DEXAMETHASONE 8mg, IV: PARACETAMOL 1gm ,IV MAGNESI SULPHATE 30mg per kg,IV DEXAMETHASONE 8mg IV giving preoperatively once before induction over 20 minutes Control Intervention1: NORMAL SALINE: 100 mL normal saline 0.9 percent weight by volume by intravenous administration given preoperatively before induction over 20 minutes CONDITION: Health Condition 1: O‐ Medical and Surgical PRIMARY OUTCOME: To compare minimum alveolar concentrationTimepoint: At baseline,10 mins,20 mins,30 mins,1 hour,2 hours, 3 hours SECONDARY OUTCOME: To compare total consumption of opioids, postoperative nausea vomiting,postoperative VAS score , adverse effect of study drugs.Timepoint: post operative at 30 mins, 1 hr , 2 hrs , 4 hrs , 6 hrs ,8 hrs,12hrs , 24 hrs INCLUSION CRITERIA: Willingness to give written informed consent, body mass inde Xless than 35 kg per meter square, American society of anaestheliogists physical status 1 and 2