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학술저널
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연세대학교 의과대학 Yonsei Medical Journal Yonsei Medical Journal 제56권 제3호
발행연도
2015.1
수록면
832 - 837 (6page)

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Purpose: This study examined the sparing effect of sufentanil on the median effectiveconcentration (EC50) of epidural ropivacaine in elderly patients undergoing elective transurethral resection of prostate (TURP). Materials and Methods: This was a prospective randomized double-blind dose-response study. Fifty eight elderlypatients with American Society of Anesthesiologists physical status I‒II who were scheduled for TURP surgery under epidural anesthesia were randomly allocatedto a group receiving 15 mL of ropivacaine (group R) or a group receiving ropivacaine plus 5 μg of sufentanil (group RS). The concentration of ropivacaine was determined by a Dixon’s up-and-down sequential allocation. The first participantreceived 0.3% of ropivacaine in both groups and subsequent concentrations were determined by the response of the previous patient in the same group. The EC50 of epidural ropivacaine was analyzed using the Dixon and Massey method. Results: The EC50 of ropivacaine during TURP surgery was 0.186% (95% confidenceinterval, 0.173‒0.200%) in group R, and 0.136% (95% confidence interval, 0.127‒0.144%) in group RS (p<0.01). No differences in Bromage scale of motor block examination and the onset time of sensory block were observed. Conclusion:Administration of 5 μg of epidural sufentanil caused a 37% reduction in the EC50 of epidural ropivacaine in elderly patients who underwent TURP surgery. Thus, sufentanil addition during surgery of TURP can decrease the dose of ropivacaineanesthesia required.

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