Abstract:

Objective To investigate the influence of injection rate of isobaric ropivacaine on sensory block, motor block and adverse effects in patients undergoing gynecologic surgery. Methods Forty-six patients undergoing selective gynecologic surgery were randomly divided into group A and group B, with 23 patients in each group. 2.0 mL of 1% ropivacaine (20 mg) was administered for spinal anesthesia. The injection rate of ropivacaine was 0.27 mL/s in group A and 0.04 mL/s in group B. The effects of sensory block and motor block were observed, adverse effects such as hypotension, nausea and vomiting were recorded, and data were compared between groups. Results Thirty minutes after ropivacaine injection, there was no significant difference in time to reach T6 in sensory block, level of maximum sensory block, time to reach maximum sensory block level, time to reach maximum motor block and prevalence of adverse effects between group A and group B (P>0.05). Conclusion There may be no significant difference in sensory block, motor block and prevalence of adverse effects between injection rates of 0.27 mL/s and 0.04 mL/s in spinal anesthesia with 20 mg isobaric ropivacaine.

Key words: isobaric, ropivacaine, injection rate, spinal anesthesia