POPULATION PHARMACOKINETICS OF CONTINUOUS INFUSION OF FACTOR VIII IN HEMOPHILIA-A PATIENTS UNDERGOING ORTHOPEDIC SURGERY

  • Magali Bolon-larger Evaluation du Médicament
  • FranÇoise Bressolle Laboratoire de Pharmacocinétique Clinique
  • Yoann Chevalier CHU de Lyon
  • Valerie Chamouard CHU de Lyon
  • Roberto Gomeni GlaxoSmithKline, King of Prussia
  • Roselyne Boulieu University Lyon1, Faculty of Pharmacy

Abstract

Objective: to develop a population pharmacokinetic model taking into account blood losses during and after orthopedic surgery in adult hemophilia A patients receiving infusion of coagulation factor VIII, and to evaluate the influence of potential covariates.

Methods: Factor VIII pharmacokinetic parameters were calculated from 24 patients. Among them, 7 were HIV+. The observations were analyzed with the mixed-effects compartment pharmacokinetic package NONMEM and the first-order conditional estimation method. To evaluate the stability and robustness of the final model the bootstrap method was used.

Results: During the model-building process, central volume of distribution (V1) was related to body weight (P = 0.0263) and viral status (P = 0.0078). Moreover, the peripheral volume of distribution was related to body weight (P=0.0362). In the final model, only the viral status was significant for V1 when compared with the base model. Posterior predictive checks and robustness analysis showed that the model adequately described the pharmacokinetic parameters. The HIV covariate accounted for 29.8% of the unexplained variation across patients for V1. V1 increased by 33.3% in HIV+ patients compared to HIV- patients.

Conclusion: A population pharmacokinetic model taking into account blood losses during and after orthopedic surgery was developed. The 33.3% increase in V1 observed in HIV+ patients explained the need for higher doses in these patients.

 

Keywords: Factor VIII, Population pharmacokinetics, Hemophilia A, Orthopedic surgery

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How to Cite
Bolon-larger, M., F. Bressolle, Y. Chevalier, V. Chamouard, R. Gomeni, and R. Boulieu. “POPULATION PHARMACOKINETICS OF CONTINUOUS INFUSION OF FACTOR VIII IN HEMOPHILIA-A PATIENTS UNDERGOING ORTHOPEDIC SURGERY”. International Journal of Pharmacy and Pharmaceutical Sciences, Vol. 7, no. 2, Dec. 2014, pp. 109-14, https://innovareacademics.in/journals/index.php/ijpps/article/view/1940.
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