Transfer of methadone across the dually perfused preterm human placental lobule

Tatiana N. Nanovskaya, Ilona A. Nekhayeva, Gary D.V. Hankins, Mahmoud S. Ahmed

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


Objective: The objective of the study was to determine the effect of gestational age and P-glycoprotein expression on transplacental transfer of methadone. Study Design: Dual perfusion of placental lobule was utilized. Methadone (200 ng/mL) and its [3H]-isotope were cotransfused from the maternal-to-fetal circuit with the marker compound antipyrine (20 μg/mL) and its [14C]-isotope. Concentration of the drugs in trophoblast tissue and both circuits was determined by liquid scintillation spectrometry. Results: Fetal transfer rate of methadone in preterm placentas was 19 ± 5.8%, and in term placentas it was 31 ± 9.7% (P < .01). Clearance index of methadone in preterm placentas (0.57 ± 0.2) was lower than in term placentas (0.95 ± 0.3, P < .01). P-glycoprotein expression was higher in preterm than term placentas. Conclusion: The ex vivo transfer of methadone across preterm placentas is 30% lower than in term placentas.

Original languageEnglish (US)
Pages (from-to)126.e1-126.e4
JournalAmerican journal of obstetrics and gynecology
Issue number1
StatePublished - Jan 2008


  • dual perfusion
  • methadone
  • pregnancy
  • preterm placenta

ASJC Scopus subject areas

  • Obstetrics and Gynecology


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