Maternal and neonatal outcomes following methadone substitution during pregnancy
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To assess the maternal and neonatal outcomes of pregnant women enrolled on a Methadone Substitution Programme (MSP).
Retrospective cohort study.
Maternity unit of a London teaching hospital and tertiary referral centre.
Pregnant women on a MSP whose antenatal care and delivery was at St Thomas’ Hospital (STH) between January 2005 and March 2008. Controls were non-MSP mothers closely matched for age, parity and delivery date during the same period.
Maternal data was collected from the Liaison Antenatal Drugs and Alcohol Service clinic records and the STH Maternity Unit’s computerised database. Neonatal data was extracted from the STH Neonatal database (part of the UK National Neonatal database).
Maternal profiles (age, gravidity, parity, ethnicity, BMI, smoking and alcohol history, relationship and employment history), pregnancy details and mode of delivery. Neonatal outcome measures to include gestation age at delivery, birth weight, head circumference, admission rates and length of stay on Special Care Baby Unit plus Neonatal Abstinence Syndrome (NAS) rates, scoring and treatment.
Compared to the non-MSP mothers (n = 88) the MSP group (n = 44) booked later and had a higher incidence of smoking (6.8 vs. 84.1 %), alcohol consumption (10.2 vs. 34.1 %). As a group, they had adverse social background. The MSP group had a higher relative risk (RR) of premature delivery [RR = 2.5, 95% confidence interval (CI) 1.66–3.88] and had lower birth weight babies (adjusted RR = 2.2; 95% CI 1.31–3.71) with smaller head circumferences (adjusted RR 1.9; 95% CI 1.06–3.38). NAS occurred in 27 % (95% CI 15.0–42.8) of the MSP group. There was no difference in congenital abnormality between the two groups, but caesarean section rate was higher in the control group.
Opiate-addicted mothers have adverse perinatal outcomes even on MSPs. In addition to the drug effect associated social, relationship and accommodation problems should also be addressed as they may affect the outcome. Pregnancy care for these women needs to continue to develop to improve overall outcomes.
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Archives of Gynecology and Obstetrics
Volume 286, Issue 4 , pp 843-851
- Cover Date
- Print ISSN
- Online ISSN
- Additional Links
- Substance misuse
- Methadone Substitution Programme
- Neonatal abstinence syndrome
- Perinatal outcome
- Industry Sectors
- Author Affiliations
- 1. ST1, Royal Victoria Infirmary, Queen Victoria Road, Newcastle-Upon-Tyne, Tyne and Wear, NE1 4LP, UK
- 2. Guy’s and St Thomas’ Hospitals NHS Foundation Trust, Westminster Bridge Road, London, SE1 7EH, UK
- 3. Department of Primary Care and Public Health Sciences, King’s College London, Capital House, Floor 5, Room 505, 42 Weston St, London, SE1 3QD, UK