title: Modelling theophylline response in individual patients with chronic bronchitis.
abstract: 1 In six patients with chronic bronchitis, serial changes in both ventilatory function and plasma theophylline concentrations were measured simultaneously for 8 h following 500 mg aminophylline intravenously. 2 Using empirical mathematical models which can integrate this data, parameters were estimated which can express response as a linear function of steady state plasma theophylline levels. 3 Taking Forced Vital Capacity (FVC) as the target response, the mean (+/- s.d.) increase in FVC was 0.06 +/- 0.02 l/micrograms ml-1, starting with pretreatment values in the range 1-21. 4 This analytical approach could be used to determine whether or not a patient with chronic bronchitis could obtain a satisfactory response to theophylline at plasma levels normally encountered in clinical practice.
mesh_terms: D000328:Adult; D000368:Aged; D000628:Aminophylline / Q000627:therapeutic use; D001991:Bronchitis / Q000188:drug therapy*; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D008875:Middle Aged; D012119:Respiration / Q000187:drug effects*; D013806:Theophylline / Q000097:blood / Q000494:pharmacology / Q000627:therapeutic use*; D014797:Vital Capacity / Q000187:drug effects
chemical_list: D000628:Aminophylline; D013806:Theophylline