Intrathecal Use of Isobaric Levobupivacaine 0.5% Versus Isobaric Ropivacaine 0.75% for Lower Abdominal and Lower Limb Surgeries.

Background This study was undertaken to compare and evaluate the efficacy of 3-ml 0.5% isobaric levobupivacaine versus 3-ml 0.75% isobaric ropivacaine in patients undergoing elective lower abdominal and lower limb surgeries. Methods We allocated 60 patients into two groups (n=30 each) to receive either a spinal block of 3-ml 0.5% isobaric levobupivacaine (group L) or 3-ml 0.75% isobaric ropivacaine (group R). Haemodynamic parameters were measured intraoperatively till the end of surgery and postoperatively for two hours. The onset and duration of sensory block and motor block were recorded. Adverse events were also recorded. The student's unpaired t-test was used for comparing the continuous variables. Results The mean age in group L was 37.83 ±16.51 years and the mean age in group R was 38.50 ±12.97 years. The mean onset of sensory block in group L (6.97 ±1.82 mins) was significantly faster than in group R (8.47 ±2.55 mins), p<0.05. Similarly, so was the mean onset of motor block in group L (10.27 ±1.92 mins) versus group R (12.93 ±2.55 mins), p<0.05. The mean duration of sensory block in group L (147.63 ±27.53 mins) was significantly longer than in group R (97.40 ±12.38 mins), p<0.05, as was the mean duration of motor block in group L (207.33 ±22.27 mins) versus group R (146.60 ±21.22 mins), p<0.05. In group L, 13.3% of patients had complications, with hypotension being the most common (6.7%); in group R, 40% had complications, of which bradycardia was the most common (13.3%). Conclusion There was an earlier onset of sensory and motor block and prolonged duration of sensory and motor block with intrathecal administration of 3-ml 0.5% isobaric levobupivacaine as compared to 3-ml 0.75% isobaric ropivacaine. Haemodynamic parameters were more stable with levobupivacaine than ropivacaine. Adverse effects were more common with ropivacaine.