Journal of Pharmacokinetics and Pharmacodynamics

, Volume 28, Issue 6, pp 533–554 | Cite as

Quantitative Relationship Between Myocardial Concentration of Tacrolimus and QT Prolongation in Guinea Pigs: Pharmacokinetic/Pharmacodynamic Model Incorporating a Site of Adverse Effect

  • Tsuyoshi Minematsu
  • Hisakazu Ohtani
  • Yasuhiko Yamada
  • Yasufumi Sawada
  • Hitoshi Sato
  • Tatsuji Iga
Article

Abstract

Clinical cases have been reported of tacrolimus (FK506)-induced QT prolongation. We have previously demonstrated sustained QT prolongation by FK506 in guinea pigs. Herein, we aimed to conduct a pharmacokinetic/pharmacodynamic (PK/PD) analysis of FK506, using a model involving the myocardial compartment. The pharmacokinetics of FK506 and its effects on QTc intervals were investigated in guinea pigs. In the pharmacokinetic study, whole blood and ventricular FK506 concentrations were analyzed, using a 4-compartment model during and after intravenous infusion of FK506 (0.01 or 0.1 mg/hr/kg). Subsequently, the concentration–response relationship between ventricular FK506 concentration and change in QTc interval was analyzed, using the maximal effect (Emax) model. Pharmacokinetic profiles of FK506 showed a delayed distribution of FK506 into the ventricle. Furthermore, the observed QT prolongation paralleled the ventricular FK506 concentrations, with no lag-time between the two. The Emax model successfully described the relationship between changes in QTc interval and ventricular FK506 concentrations. In conclusion, the PK/PD model where the myocardial drug concentration of FK506 was linked with its adverse effect could describe, for the first time, the anti-clockwise hysteresis observed in the relationship between blood FK506 concentration and QT prolongation. Such a hysteresis pattern for QT prolongation might be caused, therefore, mainly by the delayed disposition of FK506 to ventricular myocytes.

tacrolimus quinidine QT prolongation guinea pigs pharmacokinetic/pharmacodynamic modeling 

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Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Tsuyoshi Minematsu
    • 1
    • 2
  • Hisakazu Ohtani
    • 3
  • Yasuhiko Yamada
    • 1
    • 2
  • Yasufumi Sawada
    • 3
  • Hitoshi Sato
    • 4
  • Tatsuji Iga
    • 1
    • 2
  1. 1.Department of PharmacyUniversity of Tokyo HospitalJapan
  2. 2.Faculty of MedicineUniversity of TokyoTokyoJapan
  3. 3.Graduate School of Pharmaceutical SciencesKyushu UniversityFukuokaJapan
  4. 4.Graduate School of PharmacyShowa UniversityTokyoJapan

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