To Evaluate Efficacy of Epidural Dexmedetomidine and Magnesium Sulphate for Lower Abdominal and Limb Surgeries
Introduction: Central neuraxial blockade is very popular for lower abdominal and lower limb surgeries. The cost effectiveness, ease of administration, rapidity of onset, adequacy of muscle relaxation and profound analgesia during the operative as well as during the post-operative period provide excellent operating conditions and make it an indispensable technique to provide anaesthesia for the surgeries below umbilicus. Materials and method: In this study, we compared epidural dexmedetomidine and magnesium sulphate as adjuvants to ropivacaine for lower abdominal and lower limb surgeries in relation to characteristics of sensory block, motor block and sedative effect. The changes in hemodynamic parameters and side effects were also observed. This double blind, prospective, randomized controlled study was conducted on 90 adult patients of ASA physical status I-II of either sex, in the age group of 18-55 years. Patients were allocated to either of the three groups according to computer generated random numbers. Result: GROUP (R) (n =30): received bolus of 19 ml epidural injection of 0.75% ropivacaine plus 1ml normal saline. GROUP (D) (n =30): received bolus of 19 ml epidural injection of 0.75% ropivacaine plus injection dexmedetomidine 25 mcg (25 mcg/ml). GROUP (M) (n =30): received bolus of 19 ml epidural injection of 0.75% ropivacaine plus injection magnesium sulfate 50 mg (50mg/ml). Each of the solution was made to a total volume of 20 ml. The observations were made on the basis of the data collected, and were compiled in the form of master chart. Discussion: Epidural anaesthesia can be used as sole anaesthetic for procedures involving the lower abdomen and lower limb. The major advantages of epidural anaesthesia are the ability to titrate the extent and duration of anaesthesia thus making it suitable for procedures of long duration, lesser complication of haemodynamic changes than that seen with comparable levels of spinal block and puncture of durameter associated with sub-arachnoid block. Conclusion: Onset of the sensory and motor block was earliest in dexmedetomidine followed by magnesium and longest in control (ropivacaine) group. Time to two segment regression, time to first rescue analgesic of sensory block and duration of motor block was found to be longest in dexmedetomidine followed by magnesium and then in control (ropivacaine alone) group with statistically significant difference among all the three groups. The haemodynamic parameters (PR, SBP, DBP and MAP) decreased in all the groups after injecting the study drug.