Rapidly maturing fentanyl clearance in preterm neonates

DINO study group

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)

Abstract

BACKGROUND: Fentanyl is frequently used off-label in preterm newborns. Due to very limited pharmacokinetic and pharmacodynamic data, fentanyl dosing is mostly based on bodyweight. This study describes the maturation of the pharmacokinetics in preterm neonates born before 32 weeks of gestation.

METHODS: 442 plasma samples from 98 preterm neonates (median gestational age: 26.9 (range 23.9-31.9) weeks, postnatal age: 3 (range 0-68) days, bodyweight 1.00 (range 0.39-2.37) kg) were collected in an opportunistic trial and fentanyl plasma levels were determined. NONMEM V.7.3 was used to develop a population pharmacokinetic model and to perform simulations.

RESULTS: Fentanyl pharmacokinetics was best described by a two-compartment model. A pronounced non-linear influence of postnatal and gestational age on clearance was identified. Clearance (L/hour/kg) increased threefold, 1.3-fold and 1.01-fold in the first, second and third weeks of life, respectively. In addition, clearance (L/hour/kg) was 1.4-fold and 1.7-fold higher in case of a gestational age of 28 and 31 weeks, respectively, compared with 25 weeks. Volume of distribution changed linearly with bodyweight and was 8.7 L/kg. To achieve similar exposure across the entire population, a continuous infusion (µg/kg/hour) dose should be reduced by 50% and 25% in preterm neonates with a postnatal age of 0-4 days and 5-9 days in comparison to 10 days and older.

CONCLUSION: Because of low clearance, bodyweight-based dosages may result in fentanyl accumulation in neonates with the lowest postnatal and gestational ages which may require dose reduction. Together with additional information on the pharmacodynamics, the results of this study can be used to guide dosing.

Original languageEnglish
Pages (from-to)F598-F603
JournalArchives of Disease in Childhood-Fetal and Neonatal Edition
Volume104
Issue number6
Early online date1 Feb 2019
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • neonatology
  • pharmacology
  • Prospective Studies
  • Infant, Extremely Premature/physiology
  • Birth Weight/physiology
  • Humans
  • Male
  • Metabolic Clearance Rate
  • Infant, Premature/physiology
  • Gestational Age
  • Dose-Response Relationship, Drug
  • Fentanyl/pharmacokinetics
  • Female
  • Infant, Newborn

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