Onset of Action of Advair Hydrofluoroalkane (HFA) 115/21 in Comparison to Symbicort Pressurised Metered-Dose Inhalers (pMDI) 160/4.5 Measured by Impulse Oscillometry (IOS)

Asthma Clinical Trial

Official title: Onset of Action of Advair HFA 115/21 in Comparison to Symbicort pMDI 160/4.5 Measured by Impulse Oscillometry, IOS.

Status Recruiting

Clinical Trial Summary

The objectives of this study are to measure Impulse Oscillometry (IOS) in patients with asthma extensively at baseline in patients with mild-to-moderate asthma, treated with as-needed short acting beta agonist only, to measure respiratory resistance and small airway dysfunction accurately and precisely at baseline, from which to measure onset of action of Advair MDI in comparison with that of Symbicort MDI. Initial screening will assess IOS resistance and small airway dysfunction and its response to short acting beta agonist (SABA). Patients will be selected from among those who manifest a 40% improvement in small airway function assessed by IOS low frequency reactance after SABA compared to baseline. After screening, patients will be randomized to receive either Advair or Symbicort; and will be assessed at randomization before and at several intervals after initial dosing, up to 4 hours. Patients will return again 4 weeks after randomization for extended IOS (and spirometry) testing as done at randomization.

Clinical Trial Description

Eligibility criteria include age 12-45 years, with current treatment of asthma with as-needed SABA only; and manifesting an acute response to SABA at screening of 40% or greater improvement in IOS low frequency reactance. After inclusion in the protocol, all subjects will receive active treatment, either with Advair or with Symbicort. Outcome measures will include large and small airway resistance and integrated low-frequency reactance calculated directly from IOS measures, and in addition, Large Airway Resistance, Small Airway Resistance and Small Airway Compliance derived from an electrical equivalent respiratory system model. Analysis of IOS data will be done post-testing by a respiratory physiologist, experienced with use of IOS and its analysis and interpretation, blinded to which treatment each individual received. Electrical-equivalent respiratory system model analyses will be done by a biomedical engineer, blinded to which treatment each individual received. ;

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Asthma

• NCT number: NCT00867737
• Study type: Interventional
• Source: Allergy and Asthma Center of El Paso
• Contact: Rogelio Menendez, MD
• Phone: 915-591-2080
• Email: rmaacep@swbell.net
• Status: Recruiting
• Phase: Phase 4
• Start date: September 2008
• Completion date: September 2009