Objective This study compares the maternal heart rate effects of carbetocin and oxytocin during elective caesarean delivery.Design Double blind randomised single centre study (1:1).Setting University hospital providing intrapartum care.Population Fifty-six women undergoing elective caesarean section after spinal anaesthesia.Methods Haemodynamic parameters were measured noninvasively using the Task Force Ò Monitor 3040i system.Measurements were taken for 500 seconds upon administration of a slow intravenous bolus of the clinically recommended doses of 100 lg of carbetocin or 5 IU of oxytocin to prevent postpartum haemorrhage (PPH).Main outcome measure Effect on maternal heart rate (HR).Results Statistically indistinguishable haemodynamic effects were seen for both drugs, with a maximal effect at about
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