Abstract
The similarities between the melatonin and oxytocin signaling could lead to increased contractility of myometrium. We designed this randomized double-blind, placebo-controlled trial to evaluate the efficacy of melatonin in reduction of blood loss during and after the lower segment cesarean section. One hundred and twenty patients who had been scheduled for cesarean section under spinal anesthesia were enrolled in the study. We randomly allocated them to one of the three following groups to receive either melatonin 3mg (M3), melatonin 6mg (M6), or placebo (P) sublingually 20min before the surgery. The hemoglobin levels before and 12h after surgery, the mean weight of the materials used in the operation time, the need for additional oxytocic therapy, and the incidence of adverse effects were probed and recorded. There was a significant difference between the group M6 and both M3 and P in the mean weight of the materials (p = .024 and .041, respectively) and between M6 and P groups in terms of mean decrease in hemoglobin during 12h after cesarean section (p = .029). Using 6mg melatonin, sublingually, as a premedication in patients undergoing cesarean section with spinal anesthesia could statistically reduce the amount of blood loss after the lower segment cesarean section, although it may not be clinically meaningful.Registration number: ACTRN12612000117819 and ClinicalTrials.gov Identifier: NCT01572805.
Published Version
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