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)

Allergy and Asthma Center of El Paso

Status and phase: Unknown; Phase 4

Conditions: Asthma

Treatments: Drug: Advair HFA MDI 115/21; Drug: Symbicort 160/4.5 pMDI

Study type: Interventional

Funder types: Other; Industry

Identifiers

NCT00867737

CRT112430

Details and patient eligibility

About

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.

Full 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.

Enrollment: 30 estimated patients

Sex: All

Ages: 12 to 45 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Clinical diagnosis of asthma
• Asthma symptoms controlled by short-acting beta agonist as-needed
• Age 12-45 years

Exclusion criteria

• Severe asthma
• use of oral or inhaled corticosteroids within 30 days of screening

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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30 participants in 2 patient groups

Advair 115/21 MDI

Experimental group

Description:

Advair HFA 115/21 MDI Intervention = initiate intervention after screening

Treatment:

Drug: Advair HFA MDI 115/21

2 = Symbicort 160/4.5

Active Comparator group

Description:

Symbicort initiated after screening

Treatment:

Drug: Symbicort 160/4.5 pMDI