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Pharmacokinetics after a single intravenous dose of the opioid ketobemidone in neonates
Author(s) -
LUNDEBERG S.,
STEPHANSON N.,
STILLER C.O.,
EKSBORG S.
Publication year - 2012
Publication title -
acta anaesthesiologica scandinavica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.738
H-Index - 107
eISSN - 1399-6576
pISSN - 0001-5172
DOI - 10.1111/j.1399-6576.2012.02726.x
Subject(s) - medicine , pharmacokinetics , anesthesia , volume of distribution , bolus (digestion) , population , gestational age , population pharmacokinetics , analgesic , surgery , pharmacology , pregnancy , environmental health , biology , genetics
Background Ketobemidone is often used as an alternative to morphine in children in the S candinavian countries. In an earlier study, we have examined the pharmacokinetic properties in children in different age groups but have not focused on neonates. The aim of this clinical trial was to explore the pharmacokinetics of ketobemidone in neonates. Methods Fifteen full‐term neonates (eight females) from 37 gestational weeks at birth and scheduled for elective surgery were included in the trial. Their median age was 3 days (range 1–18 days). Ketobemidone hydrochloride was administered as a single intravenous bolus dose, and ketobemidone concentrations were measured by liquid chromatography‐mass spectrometry over 10 h. Pharmacokinetic parameters were calculated with standard compartmental methods. Results The median (range) values for ketobemidone clearance, apparent volume of distribution, volume of central compartment, distribution half‐life and elimination half‐life were 0.46 (0.23–0.84) l/h/kg, 4.64 (3.50–7.31) l/kg, 1.71 (0.16–3.47) l/kg, 2.85 (1.04–10.78) min and 7.26 (3.5–11.3) h. Conclusion Compared with our previous study in children older than 1 year of age, the elimination of ketobemidone appeared to be slower in full‐term neonates. Despite a low pharmacokinetic variability of ketobemidone as observed in the present neonatal patient population, we recommend individualizing the dose of ketobemidone based on observations of analgesic efficacy.