Indian Journal of Clinical Anaesthesia


Intrathecal neostigmine with hyperbaric bupivacaine on the effects of spinal anaesthesia and postoperative analgesia – randomised prospective double blind study


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Author Details: Radha Korumbil Raghavan, Ushakumary Reghunathan, Bindu Meleveethil, Anis Jassir Meleveettil

Volume : 3

Issue : 4

Online ISSN : 2394-4994

Print ISSN : 2394-4781

Article First Page : 626

Article End Page : 630


Abstract

Background and Aims: Postoperative analgesia after intrathecal bupivacaine is limited to a few hours. The aim of this study was to assess the effects of intrathecal Neostigmine added to hyperbaric bupivacaine on the onset and duration of spinal anaesthesia and in prolonging postoperative analgesia.
Methods: A prospective, randomized double blind study was conducted in 90 patients of ASA grades I and II, in three groups of 30 each, scheduled for lower limb surgeries under subarachnoid block.  Patients in Group 1 received 0.5% hyperbaric Bupivacaine 2.5ml (12.5mg) + 0.1ml of sterile normal saline, Group 2 received 0.5% hyperbaric Bupivacaine 2.5ml (12.5mg) + 0.05ml Neostigmine (25mg) + 0.05 ml sterile normal saline and Group 3 received 0.5% hyperbaric Bupivacaine 2.5ml + 0.1ml Neostigmine (50mg). The onset and duration of sensory and motor block, time of two segment regression of sensory block,   postoperative analgesia and side effects were studied. 
Results: The mean onset time of sensory and motor block were comparable in the three groups. The sensory and motor block were prolonged by the addition of Neostigmine, of which adding 50mg Neostigmine was found to be statistically significant (p value <0.001). The visual analog scale (VAS) scores were significantly lower compared to control group upto 4 hours postoperatively in the 50mg Neostigmine group.
Conclusions: 50mg Neostigmine is needed to produce significant prolongation of analgesia without significantly increasing the adverse effects, and it reduces the VAS score and analgesic consumption postoperatively.

Keywords: 
Neostigmine, Bupivacaine, Spinal anaesthesia, Postoperative analgesia