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Journal of Zhejiang University SCIENCE B 2006 Vol.7 No.12 P.992-997

http://doi.org/10.1631/jzus.2006.B0992


Dose-response study of spinal hyperbaric ropivacaine for cesarean section


Author(s):  CHEN Xin-zhong, CHEN Hong, LOU Ai-fei, LÜ, Chang-cheng

Affiliation(s):  Department of Anesthesia, Women’ more

Corresponding email(s):   chenxinz@zju.edu.cn

Key Words:  Anesthesia, Obstetric, Cesarean section, Anesthetics local, Ropivacaine, Anesthetic techniques, Subarachnoid, Dose-response


CHEN Xin-zhong, CHEN Hong, LOU Ai-fei, LÜ Chang-cheng. Dose-response study of spinal hyperbaric ropivacaine for cesarean section[J]. Journal of Zhejiang University Science B, 2006, 7(12): 992-997.

@article{title="Dose-response study of spinal hyperbaric ropivacaine for cesarean section",
author="CHEN Xin-zhong, CHEN Hong, LOU Ai-fei, LÜ Chang-cheng",
journal="Journal of Zhejiang University Science B",
volume="7",
number="12",
pages="992-997",
year="2006",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.2006.B0992"
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%0 Journal Article
%T Dose-response study of spinal hyperbaric ropivacaine for cesarean section
%A CHEN Xin-zhong
%A CHEN Hong
%A LOU Ai-fei
%A LÜ
%A Chang-cheng
%J Journal of Zhejiang University SCIENCE B
%V 7
%N 12
%P 992-997
%@ 1673-1581
%D 2006
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2006.B0992

TY - JOUR
T1 - Dose-response study of spinal hyperbaric ropivacaine for cesarean section
A1 - CHEN Xin-zhong
A1 - CHEN Hong
A1 - LOU Ai-fei
A1 - LÜ
A1 - Chang-cheng
J0 - Journal of Zhejiang University Science B
VL - 7
IS - 12
SP - 992
EP - 997
%@ 1673-1581
Y1 - 2006
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.2006.B0992


Abstract: 
Background: Spinal hyperbaric ropivacaine may produce more predictable and reliable anesthesia than plain ropivacaine for cesarean section. The dose-response relation for spinal hyperbaric ropivacaine is undetermined. This double-blind, randomized, dose-response study determined the ED50 (50% effective dose) and ED95 (95% effective dose) of spinal hyperbaric ropivacaine for cesarean section anesthesia. Methods: Sixty parturients undergoing elective cesarean section delivery with use of combined spinal-epidural anesthesia were enrolled in this study. An epidural catheter was placed at the L1~L2 vertebral interspace, then lumbar puncture was performed at the L3~L4 vertebral interspace, and parturients were randomized to receive spinal hyperbaric ropivacaine in doses of 10.5 mg, 12 mg, 13.5 mg, or 15 mg in equal volumes of 3 ml. Sensory levels (pinprick) were assessed every 2.5 min until a T7 level was achieved and motor changes were assessed by modified Bromage Score. A dose was considered effective if an upper sensory level to pin prick of T7 or above was achieved and no intraoperative epidural supplement was required. ED50 and ED95 were determined with use of a logistic regression model. Results: ED50 (95% confidence interval) of spinal hyperbaric ropivacaine was determined to be 10.37 (5.23~11.59) mg and ED95 (95% confidence interval) to be 15.39 (13.81~23.59) mg. The maximum sensory block levels and the duration of motor block and the rate of hypotension, but not onset of anesthesia, were significantly related to the ropivacaine dose. Conclusion: The ED50 and ED95 of spinal hyperbaric ropivacaine for cesarean delivery under the conditions of this study were 10.37 mg and 15.39 mg, respectively. ropivacaine is suitable for spinal anesthesia in cesarean delivery.

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Reference

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