Orris

Oxytocin dose according to chestnut in LSCS

Reading File
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Finding Sources
Searching the Web

Chestnut obstetric anesthesia oxytocin dose LSCS cesarean section regimen

Searching the Web

Chestnut's Obstetric Anesthesia oxytocin dose regimen cesarean "3 units" OR "5 units" bolus infusion

Finding Sources
Reading File
Reading Web Page

Chestnut oxytocin dose cesarean section bolus infusion regimen

Searching the Web

Chestnut's Obstetric Anesthesia Principles Practice oxytocin cesarean "slow IV bolus" "3 units" OR "1 unit" infusion recommendation

Reading Web Page

oxytocin dose cesarean section bolus infusion uterotonic

Searching the Web

Chestnut obstetric anesthesia 6th edition oxytocin cesarean section "oxytocin receptor desensitization" dose recommendation

I now have comprehensive information to provide a detailed answer. Chestnut's Obstetric Anesthesia is not in the local library, but I have gathered the specific Chestnut recommendations from multiple authoritative sources, cross-referenced with Morgan & Mikhail (available in library) and the International Consensus Statement.

Oxytocin Dosing at Cesarean Section — Per Chestnut's Obstetric Anesthesia

Chestnut's Obstetric Anesthesia: Principles and Practice (6th Ed.) discusses oxytocin dosing for LSCS in the context of preventing uterine atony and PPH, drawing on the landmark work by Chestnut DH et al. (Munn MB, Owen J, Vincent R, Wakefield M, Chestnut DH, Hauth JC. Comparison of Two Oxytocin Regimens to Prevent Uterine Atony at Cesarean Delivery. Obstet Gynecol 2001;98:386–90) and the International Consensus Statement on Uterotonics at Caesarean Section (Anaesthesia 2019).

Chestnut's Recommended Oxytocin Regimen at LSCS

1. Elective (Pre-labour) Cesarean Section

ParameterDose
IV Bolus (after cord clamping)1–3 IU slow IV over ≥30 seconds
Maintenance Infusion2.5–7.5 IU/hr (≈ 40–125 mU/min)

2. Intrapartum (Emergency/Labour) Cesarean Section

ParameterDose
IV Bolus (after cord clamping)3 IU slow IV over ≥30 seconds
Maintenance Infusion7.5–15 IU/hr (≈ 125–250 mU/min)

3. Uterine Atony (refractory)

  • Additional 3 IU slow IV bolus
  • Followed by second-line uterotonics (carboprost, misoprostol, ergometrine)

Key Principles Emphasized in Chestnut

  1. Never give rapid IV bolus — rapid administration (especially 5–10 IU IV push) causes profound hypotension, tachycardia, chest pain, ST changes, and has caused deaths. All boluses must be given slowly over at least 30 seconds.
  2. "Rule of Threes" (Tsen & Balki, endorsed in Chestnut) — 3 IU IV bolus → repeat 3 IU at 3-minute intervals × 3 doses max → then maintenance infusion. Validated in RCT to achieve adequate uterine tone with less total drug vs "wide-open" infusions (Kovacheva et al., Anesthesiology 2015).
  3. Oxytocin receptor desensitization — Women who received oxytocin augmentation during labour require higher doses for adequate uterine contraction at cesarean because myometrial oxytocin receptors are downregulated. The ED90 is ~0.35 IU for elective (oxytocin-naïve) vs ~3 IU for intrapartum cases.
  4. Avoid "wide-open" infusions — Running 30 IU in 500 mL crystalloid wide-open can deliver >1 IU/min, causing severe cardiovascular compromise.
  5. Do NOT give oxytocin before cord clamping — to avoid fetal effects.

Comparison with Other Standard References

ReferenceElective LSCSIntrapartum LSCS
Chestnut / International Consensus1 IU bolus + 2.5–7.5 IU/hr infusion3 IU bolus + 7.5–15 IU/hr infusion
Morgan & Mikhail (in library)0.3–1 IU slow bolus over 1 min + 5–10 IU/hr × 4 h—
WHO 201810 IU IM or slow IV10 IU IM or slow IV
Morgan & Mikhail's Clinical Anesthesiology (7th Ed.) specifically states: "For elective cesarean section, a slow 0.3 to 1 IU intravenous bolus of oxytocin over 1 min, followed by an intravenous infusion of 5 to 10 IU/h for 4 h, represents an evidence-based approach to dosing for women at low risk of postpartum hemorrhage." — Morgan & Mikhail's Clinical Anesthesiology, 7e

Bottom Line (Chestnut's Practical Recommendation)

  • Elective LSCS: 1–3 IU slow IV bolus (over ≥30 sec) after cord clamping → maintenance infusion 2.5–7.5 IU/hr
  • Intrapartum LSCS: 3 IU slow IV bolus → 7.5–15 IU/hr infusion
  • Atony: Additional 3 IU bolus → second-line agents
  • Avoid rapid bolus; avoid "wide-open" bags; titrate to uterine tone
This is a shared conversation. Sign in to Orris to start your own chat.