Evaluation of pharmacokinetic models of intravenous dexmedetomidine in sedated patients under spinal anesthesia

Purpose Little information is available on the predictive ability of previously published pharmacokinetic models of dexmedetomidine in patients under spinal anesthesia. We evaluated nine published pharmacokinetic models that were constructed in different study settings. Methods Sixteen patients rece...

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Bibliographic Details
Published in:Journal of anesthesia 2018-02, Vol.32 (1), p.33-40
Main Authors: Obara, Shinju, Imaizumi, Tsuyoshi, Hakozaki, Takahiro, Hosono, Atsuyuki, Iseki, Yuzo, Sanbe, Norie, Murakawa, Masahiro
Format: Article
Language:English
Subjects:
Anesthesia
Anesthesiology
Complications and side effects
Critical Care Medicine
Dexmedetomidine
Dosage and administration
Emergency Medicine
Intensive
Medicine
Medicine & Public Health
Methods
Original Article
Pain Medicine
Pharmacokinetics
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Summary:Purpose Little information is available on the predictive ability of previously published pharmacokinetic models of dexmedetomidine in patients under spinal anesthesia. We evaluated nine published pharmacokinetic models that were constructed in different study settings. Methods Sixteen patients received dexmedetomidine infusions after spinal anesthesia according to the manufacturer’s recommended regimen (6 µg/kg/h over 10 min followed by 0.2–0.7 µg/kg/h) or target-controlled infusion (initial target of 1.5 ng/ml using the Dyck model). Dexmedetomidine concentrations were measured and median performance error (MDPE), median absolute performance error (MDAPE), and wobble were calculated. Results A total of 84 blood samples were analyzed. The pharmacokinetic model reported by Hannivoort et al. had the greatest ability to predict dexmedetomidine concentrations (MDPE 5.6%, MDAPE 18.1%, and wobble 6.2%). Conclusions Hannivoort et al.’s pharmacokinetic model, constructed with a dataset obtained from healthy volunteers, can predict dexmedetomidine concentrations best during continuous infusion under spinal anesthesia.
ISSN:0913-8668
1438-8359
DOI:10.1007/s00540-017-2424-1