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Prophylactic intramuscular ephedrine prior to caesarean section
C C Rout1, D A Rocke, R Brijball
1Department of Anaesthetics, University of Natal, Durban, South Africa.
Anaesthesia and Intensive Care
|November 1, 1992
Summary
Intramuscular ephedrine before caesarean section anesthesia can cause dangerous maternal hypertension and harm newborns. This prophylactic method is not recommended due to adverse effects on both mother and child.
Area of Science:
- Anesthesiology
- Obstetrics
- Neonatology
Background:
- Hypertension is a common concern during caesarean sections.
- Ephedrine is often used to manage hypotension during anesthesia.
Purpose of the Study:
- To evaluate the effects of prophylactic intramuscular ephedrine on maternal and neonatal outcomes during caesarean section under general anesthesia.
Main Methods:
- A double-blind study involving 30 healthy parturients.
- Random allocation to receive intramuscular ephedrine (25 mg or 50 mg) or saline control 30 minutes before general anesthesia.
- Monitoring of maternal blood pressure and pH, and neonatal acid-base status.
Main Results:
- High incidence of reactive hypertension (≥20% increase) in ephedrine groups (90% in 50 mg, 50% in 25 mg).
- Significantly lower maternal pH in the 50 mg ephedrine group.
- Impaired neonatal acid-base status (lower umbilical venous and arterial pH) in the 50 mg ephedrine group, suggesting fetal asphyxia.
Conclusions:
- Prophylactic intramuscular ephedrine prior to general anesthesia for caesarean section is associated with unacceptable maternal hypertension.
- Adverse neonatal biochemical changes occur with the 50 mg ephedrine dose.
- This prophylactic technique is not recommended for caesarean sections.