title: Prediction of intravenous theophylline dosage based on a single, nonsteady-state concentration: a clinical study of childhood status asthmaticus.
abstract: A pharmacokinetic model was applied to achieve therapeutic serum theophylline concentrations rapidly in 25 children with status asthmaticus. A sustained release theophylline preparation had been taken within 36 hours by 12 children; within 14 hours, seven had taken an immediate release preparation; for six children, no theophylline was taken before hospital admission. Single serum theophylline concentrations were determined at nonsteady-state conditions within 13.5 hours of admission (median 6.75 hours). An iterative program was applied to predict the steady-state theophylline concentration as well as necessary adjustments in dosage. Measured steady-state concentrations were then compared with the predicted values. The median measured steady-state concentration was 15 mg/L, and the median predicted steady-state level was 13 mg/L. The least squares regression line was: Measured = 0.738 predicted + 4.77; r = .721, P less than .01. No patient experienced symptoms of toxicity. This technique affords the possibility of accurate prediction of steady-state theophylline concentrations and dosing requirements with a minimum number of serum concentration determinations in children with status asthmaticus.
authors.affiliation: Department of Pediatrics, University of California, Davis Medical Center.
authors.forename: G
authors.initials: G
authors.lastname: Kurland
authors.forename: D A
authors.initials: DA
authors.lastname: Anderson
authors.forename: J C
authors.initials: JC
authors.lastname: Mitsuoka
authors.forename: E D
authors.initials: ED
authors.lastname: Marquardt
mesh_terms: D001249:Asthma / Q000097:blood*; D002648:Child; D006801:Humans; D007262:Infusions, Intravenous; D013224:Status Asthmaticus / Q000097:blood* / Q000188:drug therapy; D013806:Theophylline / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D013806:Theophylline