Clinical Trials Logo

Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT04001465
Other study ID # TiTtot-2019
Secondary ID
Status Completed
Phase N/A
First received
Last updated
Start date May 14, 2019
Est. completion date June 30, 2019

Study information

Verified date March 2020
Source University of Saskatchewan
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

The study investigates the inspiratory duty cycle in subjects with and without airway hyper-responsiveness both at rest and during a bronchoprovocation challenge. The primary goal is to determine an average inspiratory duty cycle for standard use in the calculation of bronchoprovocation test results.


Description:

At least fifteen subjects with airway hyper-responsiveness and fifteen without airway hyper-responsiveness will be recruited to participate in this randomized, crossover study. Subjects will complete 2 methacholine challenges at least 24 hours apart. One methacholine challenge will entail the volumetric method using a vibrating mesh nebulizer. The second methacholine challenge will be performed identically except that the nebulizer will be fitted onto an ultrasonic nebulizer so as to measure the inspiratory duty cycle throughout the bronchoprovocation challenge.


Recruitment information / eligibility

Status Completed
Enrollment 34
Est. completion date June 30, 2019
Est. primary completion date June 30, 2019
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 18 Years and older
Eligibility Inclusion Criteria:

- Must be 18 years of age or older

- Participants with airway hyper-responsiveness must have a positive methacholine challenge

- Forced expiratory volume (FEV1) of at least 65% of predicted (based on age, height, and gender)

- Participants without airway hyper-responsiveness must have a negative methacholine challenge

- All participants must avoid strenuous exercise on test days

- No short-acting beta-2 agonist use within 6 hours of study visit

Exclusion Criteria:

- Participants without known airway hyper-responsiveness cannot have a current or historical respiratory condition (e.g. asthma, allergic rhinitis)

- Participants cannot be taking long-acting bronchodilators

- Participants cannot be pregnant or lactating

- Participants cannot have cardiovascular problems

Study Design


Intervention

Procedure:
Volumetric methacholine challenge unmodified
Bronchoprovocation challenge performed per volumetric method
Modified volumetric methacholine challenge
Bronchoprovocation challenge performed per volumetric method modified to include use of ultrasonic spirometer fitted with vibrating mesh nebulizer

Locations

Country Name City State
Canada Asthma Research Lab - University of Saskatchewan Saskatoon Saskatchewan

Sponsors (1)

Lead Sponsor Collaborator
University of Saskatchewan

Country where clinical trial is conducted

Canada, 

Outcome

Type Measure Description Time frame Safety issue
Primary Average inspiratory duty cycle in subjects with airway hyper-responsiveness measured using ultrasonic spirometer and tidal breathing The inspiratory duty cycles measured for each participant (in duplicate over at least 24 hours) will be averaged for all participants with airway hyper-responsiveness and for all participants without airway-hyperresponsiveness 24 hours
Primary Average inspiratory duty cycle in subjects without airway hyper-responsiveness The inspiratory duty cycles measured for each participant (in duplicate over at least 24 hours) will be averaged for all participants without airway hyper-responsiveness 24 hours
Secondary Within-subject variability in inspiratory duty cycle measured using ultrasonic spirometer and tidal breathing during room air inhalation Repeat measurements of inspiratory duty cycle during tidal breathing of room air collected at least 24 hours apart 24 hours
Secondary Between-subject variability within subject group (i.e. airway hyper-responsiveness group) Investigation of whether subjects differ in their inspiratory duty cycles (within their respective study group) 1 hour
Secondary Variability in inspiratory duty cycle within subjects when inhaling room air versus an aerosol while using tidal breathing through an ultrasonic spirometer Investigation of whether participants differ in their inspiratory duty cycle when inhaling room air versus a saline vapor (i.e. does an aerosol influence people's breathing pattern) 1 hour
Secondary Within-subject variability in provocative dose of methacholine causing a 20% fall in forced expiratory volume (PD20) between repeat methacholine challenges Repeat PD20 measures collected for each participant will be compared to determine if there is any significant within-subject variability in PD20 24 hours
Secondary Variability in inspiratory duty cycle with progressive airway constriction induced through methacholine challenge testing The inspiratory duty cycle in each subject will be measured throughout a methacholine challenge during each inhalation period, which will allow for determination of whether the inspiratory duty cycle changes with the progressive airway constriction (or lack thereof) induced through methacholine challenge testing 24 hours
Secondary Variability in in inspiratory duty cycle between airway hyper-responsiveness group and group without airway-hyperresponsiveness Analysis of variance to determine whether subjects differ in their inspiratory duty cycles based on their status as having or as not having airway-hyperresponsiveness 1 hour
Secondary Within-subject variability in inspiratory duty cycle measured using ultrasonic spirometer and tidal breathing during saline inhalation Repeat measurements of inspiratory duty cycle during tidal breathing of nebulized saline collected at least 24 hours apart 24 hours
Secondary Between-subject variability within subject group (no airway hyper-responsiveness group) Investigation of whether subjects differ in their inspiratory duty cycles (within their respective study group) 1 hour