TY - JOUR
T1 - A Comparison of the Accuracy of a Least Squares Regression, a Bayesian, Chiou’s and the Steady-State Clearance Method of Individualising Theophylline Dosage
AU - Hurley, Susan F.
AU - McNeil, John J.
PY - 1988/1/1
Y1 - 1988/1/1
N2 - We compared a least squares regression method, used prospectively to individualise the intravenous aminophylline and oral theophylline dosage of 48 patients, with 3 other pharmacokinetic methods — Chiou’s, the steady-state clearance and the Bayesian — used retrospectively to analyse the same patient data. Methods were compared on the basis of the similarity of their parameter estimates and the accuracy with which serum concentrations during subsequent intravenous and oral therapy could be forecast, assuming each method’s parameter estimates. The least squares and Bayesian programs were able to fit data from all but 4 and 2 patients, respectively. Mean absolute prediction errors were of the order of 20% for serum concentrations during intravenous therapy, and of the order of 40% for serum concentrations during oral therapy. The accuracy of the least squares, Bayesian and steady-state clearance methods were similar, but the accuracy of Chiou’s method was comparable only when the 2 serum concentrations needed for the method were measured between 11 and 17 hours apart; an interval which corresponds to the 1.0 to 1.5 half-lives previously suggested as desirable for implementation of the Chiou method.
AB - We compared a least squares regression method, used prospectively to individualise the intravenous aminophylline and oral theophylline dosage of 48 patients, with 3 other pharmacokinetic methods — Chiou’s, the steady-state clearance and the Bayesian — used retrospectively to analyse the same patient data. Methods were compared on the basis of the similarity of their parameter estimates and the accuracy with which serum concentrations during subsequent intravenous and oral therapy could be forecast, assuming each method’s parameter estimates. The least squares and Bayesian programs were able to fit data from all but 4 and 2 patients, respectively. Mean absolute prediction errors were of the order of 20% for serum concentrations during intravenous therapy, and of the order of 40% for serum concentrations during oral therapy. The accuracy of the least squares, Bayesian and steady-state clearance methods were similar, but the accuracy of Chiou’s method was comparable only when the 2 serum concentrations needed for the method were measured between 11 and 17 hours apart; an interval which corresponds to the 1.0 to 1.5 half-lives previously suggested as desirable for implementation of the Chiou method.
UR - http://www.scopus.com/inward/record.url?scp=0024003187&partnerID=8YFLogxK
U2 - 10.2165/00003088-198814050-00003
DO - 10.2165/00003088-198814050-00003
M3 - Article
C2 - 3396259
AN - SCOPUS:0024003187
VL - 14
SP - 311
EP - 320
JO - Clinical Pharmacokinetics
JF - Clinical Pharmacokinetics
SN - 0312-5963
IS - 5
ER -