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Comparison of Epidural Bupivacaine, Levobupivacaine and Dexmedetomidine in Patients Undergoing Vascular Surgery.

INTRODUCTION: Levobupivacaine is the s-isomer of racemic Bupivacaine. It is less cardio, neurotoxic and equally potent local anaesthetic compared to its racemate. It is known to cause less Depression of myocardial contractility. Dexmeditomidine when used via epidural route has synergistic effect with local anaesthetics. Majority of patients presenting for vascular surgery are elderly and have associated co-morbidities like diabetes, hypertension, and coronary artery disease. We intend to study safety and efficacy of epidural Levoupivacaine and Dexmedetomidine in this group of patients.

MATERIALS AND METHODS: Sixty adult patients undergoing lower limb vascular surgery under lumbar epidural anaesthesia were randomly allocated to three groups. All groups were preloaded with 10ml/kg of crystalloid solution. B group was scheduled to receive 15 ml of racemic Bupivacaine, L-group was scheduled to receive 15ml of Levobupivacaine and LD-group received 15ml of Levobupivacaine with 0.5 mics/kg Dexmeditomedine. Time to onset of sensory block to T-10, maximum sensory level achieved, Bromage scale, time to two segment regression, time to total regression, sedation level achieved and patients assessment of quality of anaesthesia were assessed. Haemodynamic parameters were monitored throughout study period. Adverse effects were noted and treated appropriately.

RESULTS: Baseline parameters were comparable among all the groups. Time to onset of sensory block to T-10 and maximum level of block achieved, was comparable among the groups. Time to two segment regression and time to total regression was significantly prolonged in LD group compared to other two groups. There was significant bradycardia noted in LD group which required treatment.

CONCLUSION: Levobupivacaine can be safely used in elderly high risk patients undergoing vascular surgery. Addition of dexmedetomidine prolongs the duration of anaesthesia and postoperative analgesia.

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