Comparative Study of Intrathecal Ropivacaine and Levobupivacaine With Fentanyl And Magnesium As Adjuvants For Lower Abdominal Surgeries

Objective: To compare the block characteristics and haemodynamic stability of intrathecal Ropivacaine and Levobupivacaine with Fentanyl and Magnesium as adjuvants for lower abdominal surgeries. Method: Sixty patients of ASA grade I and II coming for elective lower abdominal surgeries under spinal anaesthesia were randomly allocated to two groups with 30 patients in each group. Group R received Isobaric Ropivacaine 0.75% -2.5ml + Fentanyl 20μ + Magnesium 50mg and Group L received Isobaric Levobuivacaine 0.75% 2.5ml + Fentanyl 20μ + Magnesium 50mg. Sensory and motor block characteristics were assessed by pin prick and modified Bromage scale respectively and observed haemodynamics were recorded. Results: Time to reach T10 dermatome was faster in group L (1.30±0.80mins) compared to group R (4.23±0.94mins). The onset of motor block was significantly earlier in group L (1.35±0.85mins) than group R (4.63±0.85mins). Duration of analgesia was similar in both the groups (p=0.929) but resolution of sensory and motor block was significantly earlier in Levobupivacaine group compared to Ropivacaine group (p<0.001). Conclusion: Time for onset and recovery of sensory and motor block is shorter with intrathecal Levobupivacaine in combination with Fentanyl and Magnesium as adjuvants than intrathecal Ropivacaine.