Julie Fleet

A comparison of fentanyl with pethidine for pain relief during childbirth: a randomised controlled trial

To compare the efficacy of fentanyl administered via the subcutaneous (s.c.) or intranasal (i.n.) route with intramuscular (i.m.) pethidine in labouring women requesting analgesia.

Subcutaneous administration of fentanyl in childbirth: an observational study on the clinical effectiveness of fentanyl for mother and neonate.

OBJECTIVE to explore the maternal and neonatal effects of fentanyl administered subcutaneously to women during labour. DESIGN two methods were used: (1) A retrospective audit of the birth register and maternal and neonatal records for the period from January 2000 to December 2007. (2) A pilot study was also conducted on a convenience sample of women between July 2008 and October 2008. SETTING this study was conducted within a maternity unit at a rural South Australian hospital where approximately 350 babies are birthed each year. PARTICIPANTS audit participants included women who had uncomplicated pregnancies and birthed at term (37-42 weeks gestation). Women in the experimental group consisted of those who had utilised only subcutaneous fentanyl for pain relief (n=75), or nitrous oxide and oxygen prior to being administered subcutaneous fentanyl (n=196). Stratified random selection based on parity and age was used to determine the control group, which consisted of women who used no pharmacological pain relief (n=196). The pilot study involved a convenience sample of women (n=10) assessed to have an uncomplicated pregnancy and labour occurring at term (≥37 weeks gestation). MEASUREMENTS audit variables examined included the womens age, parity, labour duration, mode of birth (spontaneous or assisted), analgesia used, total dosage, time administered prior to birth, time of birth, neonatal Apgar scores, time to establish breathing, naloxone use, days spent in hospital post-birth and breast-feeding outcomes upon discharge. The pilot study explored maternal effects assessed pre- and 30 minutes post-administration of subcutaneously administered fentanyl by observing pain scores, vital signs, sedation levels, nausea/vomiting scores and anti-emetic use. To assess possible adverse effects in the neonate Apgar scores, time to establish respiration, naloxone use, transfer to neonatal nursery and breast-feeding outcomes upon discharge were recorded. FINDINGS women in the experimental groups were more likely to be induced, experienced a longer duration of labour and had an increased likelihood of an assisted vaginal birth. The average total dose of fentanyl administered was 250 μg. Neonatal outcomes were comparable between groups when examining Apgar scores <7 at 1 and 5 minutes and time to establish breathing. There was, however, a significant difference with naloxone administration between the groups. There was no significant difference between groups in hospital stay or breast-feeding on discharge. The pilot study identified a clinically significant reduction in pain scores for 78% of women following the administration of subcutaneous fentanyl, with the average pain score decreasing from 8.4 (±1.4) to 7.2 (±1.1) (paired t-test, p=0.017). Vital signs were not affected, no anti-emetics were required and all women remained alert with no sedation noted. KEY CONCLUSIONS the audit identified fentanyl use was associated with a longer length of labour, but this may be explained by more women in the experimental groups requiring induction of labour than those in the control group. However, length of hospital stay, breast-feeding rates and neonatal outcomes were comparable amongst the three groups. Results of the pilot study are consistent with those of the audit in relation to the effects on mother and neonate. In addition, the pilot study begins to provide evidence that fentanyl is efficacious in providing pain relief. IMPLICATIONS FOR PRACTICE results of this study are the first to explore the effects of fentanyl administered subcutaneously to women during labour. This method of analgesia offers women an additional choice of pain relief during childbirth and may be particularly beneficial in remote and rural settings where resources are often limited and access to specialist services difficult. Further research, however, is required to be able to generalise the outcomes and provide further data to support the clinical effectiveness of this route of administration of fentanyl.

Non-axial administration of fentanyl in childbirth: a review of the efficacy and safety of fentanyl for mother and neonate

OBJECTIVE to investigate the use of fentanyl for pain relief during childbirth administered by routes other than epidural or spinal (non-axial). In particular, aspects relating to the efficacy and safety of fentanyl for mother and neonate are explored. BACKGROUND currently, pethidine is the most widely used intramuscular opioid for the relief of labour pain but has been shown to have numerous side-effects on the mother and neonate. An alternative opioid, fentanyl, has been shown to have fewer side-effects on both mother and neonate than pethidine. Therefore, its use during childbirth was examined in this literature review. REVIEW METHODS a search of articles relating to the administration of fentanyl via non-axial routes was conducted using electronic databases, key journals and reference lists of selected research papers and reviews. RESULTS only studies of IV administration were identified from the literature findings from showed that IV administered fentanyl appeared to be a safe, efficacious opioid when administered for pain relief in childbirth. Fentanyl is a short-acting analgesic causing less sedation and nausea in adults than pethidine. In addition, no long-term fetal or neonatal effects of fentanyl were identified, with normal neonatal neurological and adaptive capacities at two hours and 24 hours after birth supporting its safe use in childbirth. KEY CONCLUSION in the studies identified, fentanyl was found to be efficacious, providing prompt analgesia with minimal side-effects to both mother and infant when administered intravenously (IV) during childbirth. In addition, no long-term fetal effects were found. RECOMMENDATIONS FOR FURTHER RESEARCH: there is a paucity of research relating to the maternal, fetal and neonatal effects of non-axial administered fentanyl other than that of IV. Further research should explore alternate routes of administration such as subcutaneous, sublingual and nasal which are less invasive and can be administered by midwives. IMPLICATION FOR PRACTICE in confirming the safe use of non-axial administration of fentanyl during childbirth, benefits include midwives being able to offer women an alternative option for pain relief. Alternative routes, such as subcutaneous, can be managed by midwives through a standing order, potentially reducing the need for additional resources. In particular, this will benefit midwifery practice in rural and remote settings where resources and access to specialised services are limited.