Effect of different concentrations of bupivacaine on level of subarachnoid block

Objective: to determine the level of anaesthesia with different concentrations but same dose (15mg) of bupivacaine in subarachnoid block. material and methods: in this study 100 patients of asa class p1 & p2 status of age 20 to 40 years and weight 50 to 80 kg undergoing lower abdominal surgery electively of both sex were included. quincke needle of size 25g at level of l4 and l5 was used and bupivacaine concertation 0.5% and 0.75% was given intrathecally. immediately patients were placed in supine position and after 10 minutes height of sensory block was noted by pin prick. results: after statistical analysis and using chi square test the calculated valve of x2 was 24.12 and 25.67 and it was falling in critical region. conclusion: normal distribution is not good to the data. different concentrations of bupivacaine (0.5% and 0.75%) but same dose (15mg) did not affect the level of spinal anaesthesia.