Fentanyl Pharmacokinetics in Pregnant Sheep after Intravenous and Transdermal Administration to the Ewe

Emma M. Heikkinen, Hanna Marja Voipio, Sakari Laaksonen, Linnea Haapala, Juha Rasanen, Ganesh Acharya, Tiina Erkinaro, Mervi Haapsamo, Heidi Hautajärvi, Hannu Kokki, Merja Kokki, Aki T. Heikkinen

Research output: Contribution to journalArticle

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Abstract

Fentanyl is used for pain treatment during pregnancy in human beings and animals. However, fentanyl pharmacokinetics during pregnancy has not been fully established. The aim of this study was to characterize fentanyl pharmacokinetics in pregnant sheep after intravenous and transdermal dosing during surgical procedure performed to ewe and foetus. Pharmacokinetic parameters reported for non-pregnant sheep and nominal transdermal dose rate were utilized for a priori calculation to achieve analgesic fentanyl concentration (0.5-2 ng/ml) in maternal plasma. A total of 20 Aland landrace ewes at 118-127 gestational days were used. In the first protocol, 1 week before surgery, 10 animals received 2 μg/kg fentanyl intravenous bolus, and on the operation day, transdermal fentanyl patches at nominal dose rate of 2 μg/kg/hr were applied to antebrachium, and ewes were then given a 2 μg/kg intravenous bolus followed by an intra-operative 2.5 μg/kg/hr infusion. In the second protocol, 10 animals received fentanyl only as transdermal patches on the operation day and oxycodone for rescue analgesia. The data were analysed with population pharmacokinetic modelling. Intra- and post-operative fentanyl concentrations were similar and slightly lower than the a priori predictions, and elimination and distribution clearances appeared slower during than before or after the surgery. Transdermal patches provided sustained fentanyl absorption for up to 5 days, but the absorption rate was slower than the nominal dose rate and showed a high interindividual variability. Further research is warranted to evaluate the clinical relevance of the observations made in sheep.

Original languageEnglish (US)
Pages (from-to)156-163
Number of pages8
JournalBasic and Clinical Pharmacology and Toxicology
Volume117
Issue number3
DOIs
StatePublished - Sep 1 2015
Externally publishedYes

Fingerprint

Cutaneous Administration
Pharmacokinetics
Fentanyl
Intravenous Administration
Sheep
Transdermal Patch
Animals
Surgery
Oxycodone
Pregnancy
Forearm
Analgesia
Analgesics
Fetus
Mothers
Plasmas
Pain

ASJC Scopus subject areas

  • Pharmacology
  • Toxicology

Cite this

Heikkinen, E. M., Voipio, H. M., Laaksonen, S., Haapala, L., Rasanen, J., Acharya, G., ... Heikkinen, A. T. (2015). Fentanyl Pharmacokinetics in Pregnant Sheep after Intravenous and Transdermal Administration to the Ewe. Basic and Clinical Pharmacology and Toxicology, 117(3), 156-163. https://doi.org/10.1111/bcpt.12382

Fentanyl Pharmacokinetics in Pregnant Sheep after Intravenous and Transdermal Administration to the Ewe. / Heikkinen, Emma M.; Voipio, Hanna Marja; Laaksonen, Sakari; Haapala, Linnea; Rasanen, Juha; Acharya, Ganesh; Erkinaro, Tiina; Haapsamo, Mervi; Hautajärvi, Heidi; Kokki, Hannu; Kokki, Merja; Heikkinen, Aki T.

In: Basic and Clinical Pharmacology and Toxicology, Vol. 117, No. 3, 01.09.2015, p. 156-163.

Research output: Contribution to journalArticle

Heikkinen, EM, Voipio, HM, Laaksonen, S, Haapala, L, Rasanen, J, Acharya, G, Erkinaro, T, Haapsamo, M, Hautajärvi, H, Kokki, H, Kokki, M & Heikkinen, AT 2015, 'Fentanyl Pharmacokinetics in Pregnant Sheep after Intravenous and Transdermal Administration to the Ewe', Basic and Clinical Pharmacology and Toxicology, vol. 117, no. 3, pp. 156-163. https://doi.org/10.1111/bcpt.12382
Heikkinen, Emma M. ; Voipio, Hanna Marja ; Laaksonen, Sakari ; Haapala, Linnea ; Rasanen, Juha ; Acharya, Ganesh ; Erkinaro, Tiina ; Haapsamo, Mervi ; Hautajärvi, Heidi ; Kokki, Hannu ; Kokki, Merja ; Heikkinen, Aki T. / Fentanyl Pharmacokinetics in Pregnant Sheep after Intravenous and Transdermal Administration to the Ewe. In: Basic and Clinical Pharmacology and Toxicology. 2015 ; Vol. 117, No. 3. pp. 156-163.
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