Cited by 152Maternal and Perinatal Health InterventionsAnesthesia and Pain ManagementMaternal and fetal healthcare

Minimum effective bolus dose of oxytocin during elective Caesarean delivery

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Butwick, A.J., Coleman, L., Cohen, S.E., Riley, E.T., Carvalho, B.·2010·British Journal of Anaesthesia

Abstract

Background The aim of this study was to determine the lowest effective bolus dose of oxytocin to produce adequate uterine tone (UT) during elective Caesarean delivery (CD).Methods Seventy-five pregnant patients undergoing elective CD under spinal anaesthesia were randomized to receive oxytocin (0.5, 1, 3, 5 units) or placebo. UT was assessed by a blinded obstetrician as either adequate or inadequate, and using a verbal numerical scale score (0-10; 0, no UT; 10, optimal UT) at 2, 3, 6, and 9 min after oxytocin administration. Minimum effective doses of oxytocin were analysed (ED(50) and ED(95)) using logistic regression. Oxytocin-related side-effects (including hypotension) were recorded.Results There were no significant differences in the prevalence of adequate UT among the study groups at 2 min (73%, 100%, 93%, 100%, and 93% for 0, 0.5, 1, 3, and 5 units oxytocin, respectively). The high prevalence of adequate UT after placebo and low-dose oxytocin precluded determination of the ED(50) and ED(95). UT scores were significantly lower in patients receiving 0 unit oxytocin at 2 and 3 min compared with 3 and 5 units oxytocin (P<0.05, respectively). The prevalence of hypotension was significantly higher after 5 units oxytocin vs 0 unit at 1 min (47% vs 7%; P=0.04).Conclusions The routine use of 5 units oxytocin during elective CD can no longer be recommended, as adequate UT can occur with lower doses of oxytocin (0.5-3 units).

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Crossref · 10.1093/bja/aeq004

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Authors
Butwick, A. J., Coleman, L., Cohen, S. E., Riley, E. T., & Carvalho, B.
Affiliations
Stanford Medicine (US)
Corresponding author
Butwick, A.J.
Venue
British Journal of Anaesthesia
Publisher
Elsevier BV
Published
2010-03
Volume
104
Issue
3
Pages
338-343
ISSN
0007-0912 (ISSN-L)
OpenAlex
W2100236150
Cited by
152
References
26
Citations by year
2026: 3 · 2025: 8 · 2024: 9 · 2023: 3 · 2022: 10 · 2021: 12 · 2020: 9 · 2019: 9 · 2018: 11 · 2017: 7 · 2016: 9 · 2015: 9 · 2014: 12 · 2013: 15 · 2012: 6
FWCI
17.45
Type
journal article
Language
en
Open access
Locations
  • British Journal of Anaesthesia (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
  • Health Sciences › Medicine › Surgery › Anesthesia and Pain Management
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Maternal and fetal healthcare
Keywords
oxytocin, bolus dosing, elective cesarean section, uterine tone, minimum effective dose, hypotension, spinal anesthesia, obstetric analgesia, dose reduction
MeSH terms
Adult, Algorithms, Anesthesia, Obstetrical, Anesthesia, Spinal, Cesarean Section, Dose-Response Relationship, Drug, Double-Blind Method, Female, Humans, Hypotension, Infusions, Intravenous, Oxytocics, Oxytocin, Pregnancy

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