OBJECTIVE: To investigate whether there is a difference in occurrence of electrocardiogram changes suggestive of myocardial ischaemia between two different doses of oxytocin. DESIGN: Double-blind randomised controlled trial. SETTING:University hospital in Sweden. POPULATION: A total of 103 healthy women undergoing elective caesarean section under spinal anaesthesia. METHODS: The participants were randomised to 5 or 10 units of oxytocin, given as an intravenous bolus. A Holter monitor was used to record electrocardiograms and non invasive blood pressure and heart rate (HR) was monitored. A blood sample was obtained 12-hour postoperatively. MAIN OUTCOME MEASURES: Depression of the ST segment. SECONDARY OUTCOMES: symptoms, Troponon I levels, mean arterial pressure (MAP), HR and blood loss. RESULTS: There was a significant difference in occurrence of ST depressions associated with oxytocin administration, 4 (7.7%) with 5 and 11 (21.6%) with 10 units, P < 0.05. The absolute risk reduction was 13.9% (95% confidence interval, 0.5-27.3). Decrease of mean MAP from baseline to 2 minutes differed, being 9 mmHg in the 5 unit group and 17 mmHg in the 10 unit group (P < 0.01). The increase in mean HR did not differ. Troponin I levels were increased in four subjects (3.9%). There were no differences in occurrence of symptoms, Troponin I levels, or estimated blood loss. CONCLUSION:ST depressions were associated with oxytocin administration significantly more often in subjects receiving 10 units compared with 5 units. Interventions to prevent hypotension during caesarean section may reduce the occurrence of ST depressions on electrocardiograms.
RCT Entities:
OBJECTIVE: To investigate whether there is a difference in occurrence of electrocardiogram changes suggestive of myocardial ischaemia between two different doses of oxytocin. DESIGN: Double-blind randomised controlled trial. SETTING: University hospital in Sweden. POPULATION: A total of 103 healthy women undergoing elective caesarean section under spinal anaesthesia. METHODS: The participants were randomised to 5 or 10 units of oxytocin, given as an intravenous bolus. A Holter monitor was used to record electrocardiograms and non invasive blood pressure and heart rate (HR) was monitored. A blood sample was obtained 12-hour postoperatively. MAIN OUTCOME MEASURES: Depression of the ST segment. SECONDARY OUTCOMES: symptoms, Troponon I levels, mean arterial pressure (MAP), HR and blood loss. RESULTS: There was a significant difference in occurrence of ST depressions associated with oxytocin administration, 4 (7.7%) with 5 and 11 (21.6%) with 10 units, P < 0.05. The absolute risk reduction was 13.9% (95% confidence interval, 0.5-27.3). Decrease of mean MAP from baseline to 2 minutes differed, being 9 mmHg in the 5 unit group and 17 mmHg in the 10 unit group (P < 0.01). The increase in mean HR did not differ. Troponin I levels were increased in four subjects (3.9%). There were no differences in occurrence of symptoms, Troponin I levels, or estimated blood loss. CONCLUSION: ST depressions were associated with oxytocin administration significantly more often in subjects receiving 10 units compared with 5 units. Interventions to prevent hypotension during caesarean section may reduce the occurrence of ST depressions on electrocardiograms.
Authors: Grace Lim; Francesca L Facco; Naveen Nathan; Jonathan H Waters; Cynthia A Wong; Holger K Eltzschig Journal: Anesthesiology Date: 2018-07 Impact factor: 7.892
Authors: Ioannis D Gallos; Helen M Williams; Malcolm J Price; Abi Merriel; Harold Gee; David Lissauer; Vidhya Moorthy; Aurelio Tobias; Jonathan J Deeks; Mariana Widmer; Özge Tunçalp; Ahmet Metin Gülmezoglu; G Justus Hofmeyr; Arri Coomarasamy Journal: Cochrane Database Syst Rev Date: 2018-04-25