• Mamta Chadha, Saibal Si, Devika Bhatt, Sushil Krishnan, Rakesh Kumar, Ashok Bansal, and Anil Kumar Sharma.
• Department of Anesthesia, Northern Railway Central Hospital, New Delhi, India.
• Anesth Essays Res. 2020 Jan 1; 14 (1): 87-91.

BackgroundThe study is based on the fact that a lower volume of local anesthetic drugs for ultrasound-guided supraclavicular brachial plexus block is useful for upper limb surgeries lasting for a shorter duration, and result in a lower incidence of complications.AimThe aim of this study is to compare the effectiveness of 35 mL of 0.5% ropivacaine with 20 mL of 0.5% ropivacaine in ultrasound-guided supraclavicular brachial plexus block for upper limb surgery.SettingPatients undergoing upper limb surgery in an industry-based government hospital in New Delhi, India. Patients were followed in the operation theater and the recovery room.DesignThe study design involves a prospective, double-blind, randomized controlled trial.Materials And MethodsA total of 40 participants were recruited for this study. Twenty participants in each group (referred to as group 20 and 30) received 20 mL and 35 mL of 0.5% ropivacaine, respectively, in ultrasound-guided supraclavicular brachial plexus block.Statistical AnalysisThe statistical analysis was performed using the software SPSS version 15 and a value of P < 0.05% was considered statistically significant. The statistical tests used included Student's t-test to compare values between the two groups for the mean of parametric data, Mann-Whitney U-test for a median of nonparametric data, and Chi-square test or Fisher's exact test for the categorical data.ResultsThe sensory and motor block onset in group 20 was 18.06 ± 3.04 and 23.89 ± 2.14 min, respectively. The sensory and motor block onset in group 30 was 17 ± 2.01 and 23.75 ± 2.22 min, respectively. The duration of analgesia in group 20 and 30 was 575.56 ± 104.39 and 730.75 ± 102.09 min, respectively (P < 0.001).ConclusionThe onset of sensory and motor block of 20 mL of 0.5% ropivacaine is comparable to 35 mL of 0.5% ropivacaine for supraclavicular brachial plexus block for upper limb surgery. There was a 21% decrease in the duration of analgesia with a decrease in volume of 0.5% ropivacaine from 35 mL to 20 mL.Copyright: © 2020 Anesthesia: Essays and Researches.

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