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Buprenorphine exposure in infants of opioid-dependent mothers at birth.
MedLine Citation:
PMID:  22428721     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Buprenorphine, a partial opioid agonist used in treating opioid dependence, is not approved in Australia for use in pregnancy. Nevertheless, many pregnant women choose to remain on the drug. AIM: To investigate cord/maternal transfer ratios for buprenorphine and norbuprenorphine in women at delivery. METHODS: Maternal and cord serum samples were collected from 10 maternal-infant pairs at delivery. Drug concentrations were measured by liquid chromatography-tandem mass spectrometry. Maternal and infant demographic information was collected. Linear regression was used to assess the relationship between maternal and cord measurements. RESULTS: Median (interquartile range) maternal age was 27 (23.8-32) years, with 90% of the women on buprenorphine before pregnancy. Median infant birthweight was 3148 (3088-3545) g and 60% of infants had neonatal abstinence requiring admission to a neonatal intensive care unit for a median of 8.5 (2.5-16.3) days. Median maternal buprenorphine daily dose was 8.5 mg (range 1-28 mg). Mean (95% confidence interval) cord serum concentrations of buprenorphine and norbuprenorphine were 0.4 (0.3-0.5) μg/L and 1.2 (0.9-1.4) μg/L, respectively. Mean maternal concentrations of buprenorphine and norbuprenorphine were 1.0 (0.6-1.4) μg/L and 1.2 (0.9-1.4) μg/L, respectively. Mean cord/maternal ratios were 0.43 (0.36-0.5) for buprenorphine and 0.53 (0.43-0.63) for norbuprenorphine. Maternal buprenorphine and norbuprenorphine concentrations and ratio of buprenorphine/norbuprenorphine explained 85.7, 69.6 and 94.4%, respectively, of variation in the corresponding cord concentrations. CONCLUSION: Usual therapeutic doses of buprenorphine administered to pregnant women resulted in low concentrations of buprenorphine and norbuprenorphine in maternal serum and a low transfer to the fetal circulation (cord plasma) at birth.
Authors:
Anne E Bartu; Kenneth F Ilett; L Peter Hackett; Dorota A Doherty; Dale Hamilton
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-19
Journal Detail:
Title:  The Australian & New Zealand journal of obstetrics & gynaecology     Volume:  -     ISSN:  1479-828X     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0001027     Medline TA:  Aust N Z J Obstet Gynaecol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors ANZJOG © 2012 The Royal Australian and New Zealand College of Obstetricians and Gynaecologists.
Affiliation:
Faculty of Health Sciences, School of Nursing and Midwifery, Curtin University of Technology, Australia.
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