ONDANSETRON AND EFFECTIVE DOSE IN 50% OF SUBJECTS OF PROPHYLACTIC NOREPINEPHRINE INFUSIONS FOR PREVENTING SPINAL ANESTHESIA-INDUCED HYPOTENSION DURING CESAREAN DELIVERY

Hypotension Clinical Trial

Official title:

A PROSPECTIVE, RANDOMIZED, DOUBLE-BLINDED STUDY OF THE EFFECT OF A STANDARD DOSE OF INTRAVENOUS ONDANSETRON ON THE EFFECTIVE DOSE IN 50% OF SUBJECTS OF PROPHYLACTIC NOREPINEPHRINE INFUSIONS FOR PREVENTING SPINAL ANESTHESIA-INDUCED HYPOTENSION DURING CESAREAN DELIVERY

Clinical Trial Details — Status: Not yet recruiting

Administrative data

• NCT number: NCT04703088
• Other study ID #: 2021-5610
• Status: Not yet recruiting
• Phase: Phase 3
• Start date: June 2021
• Est. completion date: August 2021

Study information

• Verified date: January 2021
• Source: Laval University
• Contact: Romain LANCHON
• Phone: +1 418-525-4444
• Email: romain.lanchon[@]gmail.com
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Spinal anesthesia is the preferred technique for elective cesarean section as per ASA guidelines. Hypotension is the main complication of this technique and is secondary to both sympatholysis and its associated decrease in systemic vascular resistance and to the Bezold-Jarisch reflex, which causes hypotension and bradycardia in response to noxious stimuli detected in the cardiac ventricles. In pregnant patients, spinal anesthesia induced hypotension is worsened by compression of the aorta and inferior vena cava by the gravid uterus. In this setting, hypotension could lead to uteroplacental hypoperfusion and fetal distress. In its 2020 guidelines for enhanced recovery after cesarean section, SOAP states that preventing spinal-induced hypotension is an important strategy to enhance maternal and neonatal outcomes in cesarean delivery Recent studies showed that 5-hydroxytryptamine-3 receptor antagonists, mostly used as nausea and vomiting prophylaxis agents, also contributed to inhibit the Bezold-Jarisch reflex and its associated hemodynamic consequences. Ondansetron is the most studied molecule in this field. Many recent studies and meta-analyses show renewed interest in the use of norepinephrine as a first line agent for preventing and treating spinal anesthesia-induced hypotension in obstetric anesthesia practice instead of phenylephrine. Norepinephrine has the advantage of a better cardiac output and cardiac frequency as compared to phenylephrine without any fetal side effect. The combination of ondansetron and phenylephrine for the prevention of spinal anesthesia-induced hypotension has been studied, but not the combination of ondansetron and norepinephrine. The main objective of this study is to evaluate the sparing effect of a standard dose of ondansetron on norepinephrine consumption during elective cesarean section under spinal anesthesia by determining the effective dose in 50% of subjects (ED50) of a prophylactic norepinephrine infusion after receiving a single dose of 4 mg of ondansetron or a saline control.

Description:

Vital signs are measured in the preparation area before entrance in the operation theater. The following measures are taken in the supine position every three minutes for three measures: blood pressure and cardiac frequency. The mean blood pressure and cardiac frequency become the reference measure for each patient. Upon entrance in the operation theater, anesthesia care is given in a standardized manner: - Supine positioning of the parturient on the operating table - Standard monitoring of vitals signs every minute for the time of the study, including systolic, diastolic an mean blood pressures, cardiac frequency and SpO2 - 18G intravenous catheter insertion on the forearm - Randomization of the patient in one of the two groups followed by blind administration of ondansetron or saline - 5 minute wait period before sitting the patient for spinal anesthesia - Standardized spinal anesthesia: Whitacre 25G spinal needle, L4-L5 intervertebral space, hyperbaric bupivacaine 12mg + fentanyl 10 mcg + morphine 100 mcg - Upon injection of the spinal medication: 1000 ml Ringer lactate coloading and start of the iv norepinephrine infusion upon study protocol. - Evaluation of the sensitive block level at 5 and 10 minutes, a level of T6 is needed to start surgery - Nausea and vomiting prophylaxis in both groups with metoclopramide 10 mg and dexamethasone 4 mg if no contraindication. Nausea and vomiting per cesarean section will be treated with dimenhydrinate 25 mg - Bradycardia (HR below 60) will be treated with atropine 0,4 mg - Multimodal post-operative analgesia with intra rectal acetaminophen 1000 mg and indomethacin 100 mg Norepinephrine infusion protocol: - The rate of the infusion pump is blindly set in mcg/kg/min by one of the investigators before the entrance of the patient and the anesthesia team in the operating room. The setting is hidden from the main physician at all times and the perfusion is started when the spinal medication is injected. - For the first patient of each group (saline and ondansetron) the norepinephrine infusion is started at 0,05 mcg/kg/min until the end of the study - Hypotension (as defined as a value inferior or equal to 80% of the systolic blood pressure reference value) is treated by the anesthesiologist with a 4 mcg bolus of norepinephrine from a prepared syringe of norepinephrine 4 mcg/ml - Hypertension (as defined as a value superior or equal to 120% of the systolic blood pressure reference value) is treated by stopping the norephineprine infusion and restarting it when the value is inferior to 120% of the reference value. - For the following patients, the norepinephrine infusion rate will be adjusted by up and down allocation following the results of the previous patient: if no hypotension occurred (no bolus needed): the infusion rate is decreased by 0,005 mcg/kg/min (for example from 0,05 mcg/kg/min to 0,045 mcg/kg/min) / if at least one hypotension occurred (at least one bolus needed): the infusion rate is increased by 0,005 mcg/kg/min (for example from 0,05 mcg/kg/min to 0,055 mcg/kg/min) The study is stopped at the fetal delivery.

Recruitment information / eligibility

• Status: Not yet recruiting
• Enrollment: 60
• Est. completion date: August 2021
• Est. primary completion date: August 2021
• Accepts healthy volunteers: No
• Gender: Female
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• parturients with a singleton pregnancy at term (37 week's gestation and more)
• elective cesarean delivery under spinal anesthesia
• American Society of Anesthesiologists physical status < III

Exclusion Criteria:

• patient refusal
• allergy or hypersensitivity to Norepinephrine or Ondansetron
• Use of monoamine oxidase inhibitors, triptyline or imipramine antidepressants
• Long QT syndrome or another cause of prolonged QT
• significant preexisting maternal disease (cardiovascular or cerebrovascular disease or coagulopathy, diabetes mellitus)
• pre-existing or pregnancy-induced hypertension
• pathological pregnancy (ruptured membranes, pre-eclampsia, placenta praevia, gestational diabetes)
• body mass index < 18 or > 40
• height < 150 or > 180
• fetal abnormalities
• contraindication to spinal anesthesia

Related Conditions & MeSH terms

• Anesthesia; Adverse Effect, Spinal and Epidural
• Cesarean Section
• Hypotension

Intervention

Drug:
• Ondansetron 4 MG
2 mL of a solution of Ondansetron containing 2mg/ml in a 3 ml syringe will be given intravenously to a patient five minutes before positioning for induction of spinal anesthesia
• 0.9% Saline
2 mL of 0,9% Saline in a 3 ml syringe will be given intravenously to a patient five minutes before positioning for induction of spinal anesthesia

Locations

Country	Name	City	State
n/a

Sponsors (2)

Lead Sponsor	Collaborator
Laval University	CHU de Quebec-Universite Laval

References & Publications (29)

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Gao L, Zheng G, Han J, Wang Y, Zheng J. Effects of prophylactic ondansetron on spinal anesthesia-induced hypotension: a meta-analysis. Int J Obstet Anesth. 2015 Nov;24(4):335-43. doi: 10.1016/j.ijoa.2015.08.012. Epub 2015 Aug 22. — View Citation

Hasanin AM, Amin SM, Agiza NA, Elsayed MK, Refaat S, Hussein HA, Rouk TI, Alrahmany M, Elsayad ME, Elshafaei KA, Refaie A. Norepinephrine Infusion for Preventing Postspinal Anesthesia Hypotension during Cesarean Delivery: A Randomized Dose-finding Trial. Anesthesiology. 2019 Jan;130(1):55-62. doi: 10.1097/ALN.0000000000002483. — View Citation

Heesen M, Hilber N, Rijs K, Rossaint R, Girard T, Mercier FJ, Klimek M. A systematic review of phenylephrine vs. noradrenaline for the management of hypotension associated with neuraxial anaesthesia in women undergoing caesarean section. Anaesthesia. 2020 Jun;75(6):800-808. doi: 10.1111/anae.14976. Epub 2020 Feb 3. — View Citation

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Karacaer F, Biricik E, Ünal I, Büyükkurt S, Ünlügenç H. Does prophylactic ondansetron reduce norepinephrine consumption in patients undergoing cesarean section with spinal anesthesia? J Anesth. 2018 Feb;32(1):90-97. doi: 10.1007/s00540-017-2436-x. Epub 2017 Dec 14. — View Citation

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Ngan Kee WD, Lee SWY, Ng FF, Lee A. Norepinephrine or phenylephrine during spinal anaesthesia for Caesarean delivery: a randomised double-blind pragmatic non-inferiority study of neonatal outcome. Br J Anaesth. 2020 Oct;125(4):588-595. doi: 10.1016/j.bja.2020.05.057. Epub 2020 Jul 15. — View Citation

Ngan Kee WD. A Random-allocation Graded Dose-Response Study of Norepinephrine and Phenylephrine for Treating Hypotension during Spinal Anesthesia for Cesarean Delivery. Anesthesiology. 2017 Dec;127(6):934-941. doi: 10.1097/ALN.0000000000001880. — View Citation

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Qian J, Liu L, Zheng X, Xiao F. Does an Earlier or Late Intravenous Injection of Ondansetron Affect the Dose of Phenylephrine Needed to Prevent Spinal-Anesthesia Induced Hypotension in Cesarean Sections? Drug Des Devel Ther. 2020 Jul 16;14:2789-2795. doi: 10.2147/DDDT.S257880. eCollection 2020. — View Citation

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Singh PM, Singh NP, Reschke M, Ngan Kee WD, Palanisamy A, Monks DT. Vasopressor drugs for the prevention and treatment of hypotension during neuraxial anaesthesia for Caesarean delivery: a Bayesian network meta-analysis of fetal and maternal outcomes. Br J Anaesth. 2020 Mar;124(3):e95-e107. doi: 10.1016/j.bja.2019.09.045. Epub 2019 Dec 4. Review. — View Citation

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Wang M, Zhuo L, Wang Q, Shen MK, Yu YY, Yu JJ, Wang ZP. Efficacy of prophylactic intravenous ondansetron on the prevention of hypotension during cesarean delivery: a dose-dependent study. Int J Clin Exp Med. 2014 Dec 15;7(12):5210-6. eCollection 2014. — View Citation

Xiao F, Wei C, Chang X, Zhang Y, Xue L, Shen H, Ngan Kee WD, Chen X. A Prospective, Randomized, Double-Blinded Study of the Effect of Intravenous Ondansetron on the Effective Dose in 50% of Subjects of Prophylactic Phenylephrine Infusions for Preventing Spinal Anesthesia-Induced Hypotension During Cesarean Delivery. Anesth Analg. 2020 Aug;131(2):564-569. doi: 10.1213/ANE.0000000000004534. — View Citation

Xu S, Shen X, Liu S, Yang J, Wang X. Efficacy and safety of norepinephrine versus phenylephrine for the management of maternal hypotension during cesarean delivery with spinal anesthesia: A systematic review and meta-analysis. Medicine (Baltimore). 2019 Feb;98(5):e14331. doi: 10.1097/MD.0000000000014331. — View Citation

* Note: There are 29 references in all — Click here to view all references

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	ED50 Norepinephrine	The effective dose in 50% of subjects (ED50) of a prophylactic norepinephrine infusion for preventing hypotension in patients who received a single dose of intravenous ondansetron 4mg or saline control five minutes before spinal anesthesia for elective cesarean delivery	At the fetal delivery
Secondary	Total consumption of Norepinephrine	The total consumption of Norepinephrine (mcg/kg) in the two groups (pump infusion and bolus)	At the fetal delivery