Pradhan, AmitDash, TaranginiRoutray, Sidharth SrabanMishra, DebasisMahanta, Indrajit2017-01-172017-01-172017-01Pradhan Amit, Dash Tarangini, Routray Sidharth Sraban, Mishra Debasis, Mahanta Indrajit. A Comparison of Intrathecal Isobaric Ropivacaine 0.5% and 0.75% for Orthopaedic Lower Limb Surgeries and Lower Abdominal Surgeries. Annals of International Medical and Dental Research. 2017 Jan-Feb; 3(1): 29-33.http://imsear.searo.who.int/handle/123456789/181918Background: Aim: This study was done to evaluate the onset, extent and duration of sensory and motor block and side effects of ropivacaine when used in spinal anaesthesia in lower limb orthopedic and lower abdominal surgery. Methods: A prospective randomized double blind study was conducted on 60 patients of ASA status I and II, posted for lower limb orthopaedic and lower abdominal surgery. All patients were randomly allocated into two groups of 30 each; group I received 3ml of isobaric ropivacaine 0.5%(15mg) and group II received 3ml of 0.75% (22.5mg)isobaric ropivacaine in subarachnoid block. The onset, extent, duration of sensory and motor block and side effects were recorded. Results: Onset of sensory block and highest level of sensory block achieved was comparable in both the groups. The duration of sensory block at T10 and total duration of sensory blockade was prolonged in-group II in comparison to group I, which was statistically significant. The onset time of motor block was comparable in both groups. Time to maximum degree of motor block was longer in group I (17.45±6.63min) compared to group II(11.04±4.26min) which was statistically significant. Total duration of motor block was longer in group II(152.60±23.02min) compared to group I( 112.62±13.72min)which was statistically significant. Conclusion: 0.75% ropivacaine when used in spinal subarachnoid block prolonged the sensory and motor block in comparison to 0.5% ropivacaine.enabdominalintrathecalropivacaineorthopaedicArticle