A prospective randomized clinical study to compare the effect of buprenorphine and fentanyl as adjuvants tobupivacaine for post operative epidural analgesia in lower limb orthopedic surgeries.

During the above study period 60 patients posted for lower limb orthopedic surgeries will undergo Spinal anesthesia + Epidural analgesia. Pre-anesthetic evaluation will be done . patients will be shifted to Ot and all standard monitors attached. Patient will be premedicated with Ondansetron 4mg IV. In supine or lateral position 20G portex epidural catheter will be inserted via an 18G Tuohy needle by loss of resistance to air technique and fixed after giving test dose. A 25G spinal needle will  be inserted in l3 l4 interspace and after confirming free flow of csf spinal anesthesia given with bupivacaine. patient monitored intraoperatively . In the post-operative period when patient complains of pain and VAS score is above 5 study drug will be given through epidural catheter

Group A- 2ml 0.5% bupivacaine + 1.5mcg/kg buprenorphine diluted with distilled water upto 10ml

Group B- 2ml bupivacaine + 1mcg/kg fentanyl diluted with distilled water upto 10ml

the patient pulse rate , blood pressure ans vas score will be recorded every 5 minutes for first half hour followed by every hour.