A comparision of epidural butorphanol and fentanyl as an adjuvant with 0.5%levobupivacaine for postoperative analgesia in patients undergoing vaginal hysterectomy

This will be a double blinded randomized study conducted to evaluate inj. Butorphenal 2mg and inj. fentanyl 50 mcg as an adjuvant with inj.levobupivacaine 0.5% 15ml epidurally in  patients who are between 30 to 70yr old, ASA grade 1 or 2 with excemption of all exclusion criteria mentioned above and  undergoing vaginal hysterectomy under epidural analgesia with primary objective of comparing the  duration of analgesia. seconadry objectives being onset and duration of sensory block, onset and duration of motor block, cardiovascular effects, side effects . participants will be allocated in to 2 groups  each with 40 sample size . Group LB receiving inj.butorphenal group LF receiving inj.fentanyl as an adjuvant with local anaesthetic epidurally in above mentioned dosagey. pre anaesthetic evaluation will be done previous day , necessary premedication will be given , informed written consent will be taken prior  to surgery. all emergency drugs and equipments will be kept ready in prior. under all aseptic precautions respective drugs will be given epidurally to respective group of patient. patient will be monitored intraoperative and postoperatively. all the parameters will be recorded at pre described interval  and documented. data will be analyses statistically using standard qualitative and quantitative tests. continuous variables will be analyzed using student paired test and chategorical variables will be analyzed using chi-square test. P value of less than  0.05  will be considered significant.