1. Methacholine challenge tests to demonstrate therapeutic equivalence of terbutaline sulfate via different Turbuhaler (R) devices in patients with mild to moderate asthma
- Author
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Leif Bjermer, Kajs Marie Schützer, Maarten van den Berge, Dirkje S. Postma, Marie Carlholm, Jonas Román, Louis-Philippe Boulet, Göran Eckerwall, Tore Persson, Paul M. O'Byrne, Ola Beckman, Gail M. Gauvreau, and Groningen Research Institute for Asthma and COPD (GRIAC)
- Subjects
Pulmonary and Respiratory Medicine ,INHALED HISTAMINE ,Terbutaline ,Equivalence ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Pharmacology (medical) ,PROTECTION ,Turbuhaler((R)) ,Asthma ,030505 public health ,business.industry ,Biochemistry (medical) ,BRONCHIAL RESPONSIVENESS ,Terbutaline Sulfate ,medicine.disease ,Crossover study ,Methacholine challenge ,Confidence interval ,030220 oncology & carcinogenesis ,Anesthesia ,Bronchoconstriction ,Methacholine ,medicine.symptom ,0305 other medical science ,business ,medicine.drug - Abstract
Background/Objective: To demonstrate therapeutic equivalence of terbutaline via two different Turbuhaler((R)) devices by evaluating its protective effect against methacholine-induced bronchoconstriction in stable asthma.Methods: In this double-blind, double-dummy, multicentre, single-dose, 4-way crossover study, patients with stable mild-to-moderate asthma (FEV1 >= 80% predicted) were randomised to 0.5 or 1.5 mg terbutaline via either Turbuhaler((R)) M2 or Turbuhaler((R)) M3 followed by a methacholine challenge test. The primary outcome variable was the concentration of methacholine causing a 20% drop in FEV1 (PC20). Patients had a PC20 methacholine Results: 60 patients (mean age 31.1 years [range:18-64]; mean FEV1 92.1% predicted normal [78.4 -120.6%]) were randomised to treatment; all completed the study. There was a clear dose-response for both devices. The within-device ratios (1.5 mg:0.5 mg) were 1.79 and 1.87 for Turbuhaler((R)) M3 and M2, respectively (both p Conclusions: Bronchoprotection using a standardised methacholine challenge model proved to be an effective design to elucidate therapeutic equivalence between devices in patients with mild-to-moderate asthma. The findings indicate that patients may switch from one type of Turbuhaler((R)) to the other without adjustment of therapy. Moreover, they show the robustness and utility of this study design and its suitability for investigating therapeutic equivalence. (c) 2017 Elsevier Ltd. All rights reserved.
- Published
- 2017