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Prescribing intramuscular opioids for labour analgesia in consultant-led maternity units: a survey of UK practice.

Author(s): Tuckey JP, Prout RE, Wee MY

Affiliation(s): Departments of Anaesthesia, Royal United Hospital Bath, Bristol Royal Infirmary and Poole Hospital NHS Trust, UK.

Publication date & source: 2008-01, Int J Obstet Anesth., 17(1):3-8. Epub 2007 Nov 5.

BACKGROUND: Intramuscular opioids are widely used for analgesia in labour. We conducted a postal survey to establish current prescribing and monitoring guidelines for intramuscular opioids in consultant-led obstetric units in the UK. METHODS: A postal questionnaire was sent between December 2005 and January 2006 to the lead obstetric anaesthetist of all 234 consultant-led obstetric units in the UK. We enquired about dose regimens of intramuscular opioids in labour and monitoring of mother, fetus and neonate. RESULTS: The response rate was 71%; 84.4% of responding units used pethidine and 34.1% diamorphine. Meptazinol and morphine were available in 13.8% and 13.2% of units respectively. Some units used more than one opioid. The choice of opioid was dictated mainly by tradition (65.3%) and familiarity (40.7%). Prophylactic antiemetics were co-administered in 73.7% of units, the most commonly used being prochlorperazine (30.5%). Vital signs were monitored in 91.6% of units: in total 10.2% measured haemoglobin oxygen saturations and 4.8% respiratory rate. Pain scores were recorded in 13.7% of units. CONCLUSIONS: When compared with previous studies the use of intramuscular diamorphine is increasing in UK consultant-led obstetric units, although pethidine remains the widely used opioid. At present this change cannot be justified by a suitably powered, randomised study comparing intramuscular pethidine with diamorphine.

Page last updated: 2008-01-02

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