Isobaric ropivacaine and isobaric bupivacaine in motor blockade during spinal anaesthesia

Objective: to compare the mean duration of motor blockade between 0.5% isobaric ropivicaine and 0.5% isobaric bupivacaine after spinal anaesthesia for lower limb surgery. material and methods: this randomized controlled trial study was conducted in main operation theatre of khyber teaching hospital from april 2013 to october 2013. a total of 88 patients were randomly allocated in two groups by lottery method,patients in group a (n=44) received ropivacaine 15 mg of 0.5% and patients in group b (n=44) received 15 mg of 0.5% bupivacaine. spinal anaesthesia was given after preloading with 1000 ml of lactated ringers. the duration of motor blockade was assessed by modified bromage scale. results: there was significant difference between the two groups in the mean-time of duration of motor block. mean duration of motor blockade in group a was found to be 123.98±9.24 minutes and in group b it was 183.40±11.14 minute. this was clinically and statistically highly significant. conclusion: fifteen mg isobaric ropivacaine provided significantly shorter duration of motor block compared to 15 mg isobaric bupivacaine for lower limb surgeries by spinal anaesthesia. © 2015,khyber medical college. all rights reserved.