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Dexamethasone Versus Ondansetron for Preventing Post-Spinal Hypotension in Preeclampsia

NCT07793760 · Status: NOT_YET_RECRUITING · Phase: PHASE4 · Type: INTERVENTIONAL · Enrollment: 110

Last updated 2026-08-31

No results posted yet for this study

Summary

This study compares the efficacy and safety of intravenous dexamethasone versus intravenous ondansetron in preventing low blood pressure (hypotension) following spinal anesthesia in pregnant women with preeclampsia undergoing scheduled cesarean delivery.

Spinal anesthesia is the preferred anesthetic method for cesarean delivery, but it frequently causes a sudden drop in maternal blood pressure. In patients with preeclampsia, post-spinal hypotension can compromise blood flow to the placenta and vital organs. While traditional vasopressor medications are used to restore blood pressure, non-adrenergic prophylactic agents such as dexamethasone and ondansetron may help maintain hemodynamic stability through different physiological pathways.

Participants will be randomly assigned to receive either intravenous dexamethasone (8 mg) or intravenous ondansetron (4 mg) 15 minutes prior to the initiation of spinal anesthesia. Blood pressure, heart rate, vasopressor requirements, optic nerve sheath diameter, and maternal and neonatal outcomes will be monitored throughout the surgery and during the immediate postoperative period.

Conditions

  • Preeclampsia
  • Spinal Anesthesia-Induced Hypotension
  • Cesarean Section

Interventions

DRUG

Dexamethasone

Intravenous dexamethasone 8 mg diluted with 0.9% normal saline to a total volume of 10 mL, administered slowly over approximately one minute, 15 minutes before the induction of spinal anesthesia.

DRUG

Ondansetron

Intravenous ondansetron 4 mg diluted with 0.9% normal saline to a total volume of 10 mL, administered slowly over approximately one minute, 15 minutes before the induction of spinal anesthesia.

Sponsors & Collaborators

  • Assiut University

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
40 Years
Sex
FEMALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2026-10-31
Primary Completion
2027-10-31
Completion
2027-11-30

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07793760 on ClinicalTrials.gov