Document Detail

Population pharmacokinetics modeling of levetiracetam in Chinese children with epilepsy.
MedLine Citation:
PMID:  22669118     Owner:  NLM     Status:  In-Data-Review    
Aim:To establish a population pharmacokinetics (PPK) model of levetiracetam in Chinese children with epilepsy.Methods:A total of 418 samples from 361 epileptic children in Peking University First Hospital were analyzed. These patients were divided into two groups: the PPK model group (n=311) and the PPK validation group (n=50). Levetiracetam concentrations were determined by HPLC. The PPK model of levetiracetam was established using NONMEM, according to a one-compartment model with first-order absorption and elimination. To validate the model, the mean prediction error (MPE), mean squared prediction error (MSPE), root mean-squared prediction error (RMSPE), weight residues (WRES), and the 95% confidence intervals (95% CI) were calculated.Results:A regression equation of the basic model of levetiracetam was obtained, with clearance (CL/F)=0.988 L/h, volume of distribution (V/F)=12.3 L, and K(a)=1.95 h(-1). The final model was as follows: K(a)=1.56 h(-1), V/F=12.1 (L), CL/F=1.04×(WEIG/25)(0.583) (L/h). For the basic model, the MPE, MSPE, RMSPE, WRES, and the 95%CI were 9.834 (-0.587-197.720), 50.919 (0.012-1286.429), 1.680 (0.021-34.184), and 0.0621 (-1.100-1.980). For the final model, the MPE, MSPE, RMSPE, WRES, and the 95% CI were 0.199 (-0.369-0.563), 0.002082 (0.00001-0.01054), 0.0293 (0.001-0.110), and 0.153 (-0.030-1.950).Conclusion:A one-compartment model with first-order absorption adequately described the levetiracetam concentrations. Body weight was identified as a significant covariate for levetiracetam clearance in this study. This model will be valuable to facilitate individualized dosage regimens.
Ying-Hui Wang; Li Wang; Wei Lu; De-Wei Shang; Min-Ji Wei; Ye Wu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta pharmacologica Sinica     Volume:  33     ISSN:  1745-7254     ISO Abbreviation:  Acta Pharmacol. Sin.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-06-06     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100956087     Medline TA:  Acta Pharmacol Sin     Country:  United States    
Other Details:
Languages:  eng     Pagination:  845-51     Citation Subset:  IM    
Pediatric Department of Peking University First Hospital, Beijing 100034, China.
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