A Comparison of Three Nebulizers for Standard Clinical and Research Use in Methacholine Challenge Testing

Asthma Clinical Trial

Official title: A Comparison of Three Nebulizers for Standard Clinical and Research Use in Methacholine Challenge Testing

Status Completed

Clinical Trial Summary

The study will assess three different nebulizers for use in methacholine challenge testing in order to determine if the Aeroneb Solo would make a suitable replacement for the long-used and now obsolete Wright and Bennett-Twin nebulizers. Results from each device will be compared to evaluate whether current guidelines for the methacholine challenge should be updated for superior standardization.

Clinical Trial Description

Sixty asthmatics (20 at each testing site: University of Saskatchewan, McMaster University, Laval University) will be recruited to undergo this randomized, triple cross-over study. Three nebulizers will be tested, the Wright, the Bennett-Twin and the new Aeroneb Solo.

Breakdown of study procedure: Participants will undergo three (potentially four) methacholine challenges, one with each nebulizer in randomized order. An additional methacholine challenge may be performed for screening purposes if the participant has not undergone methacholine challenge testing in one of the participating labs in the previous 6 months. The screening challenge will be performed with the standard nebulizer used at the given testing site (i.e. the Wright or the Bennett-Twin).

The methacholine challenges performed with the Wright and Bennett-Twin nebulizers will follow the two-minute tidal breathing protocol as outlined in the 1999 American Thoracic Society Guidelines for Methacholine Challenge Testing. The testing protocol used with the Aeroneb solo will be identical save for a 1 min inhalation period instead of 2 min. Each challenge will be stopped when a participant's forced expiratory volume in 1 second (FEV1) drops at least 20%. This will allow for the determination of the participant's PC20 (provocative concentration of methacholine causing a 20% fall in FEV1), which will subsequently be converted to a PD20 (provocative dose) value. A minimum 24-hour washout period between challenges will be enforced. ;

Related Conditions & MeSH terms

• Asthma

• NCT number: NCT02822859
• Study type: Interventional
• Source: University of Saskatchewan
• Status: Completed
• Phase: N/A
• Start date: June 2016
• Completion date: September 2016