RELVAR Effects on Parasternal Muscle Activity, Diaphragm, and Ventilation in Severe COPD
Procedure: Parasternal EMG
Procedure: Phrenic magnetic stimulation
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Basic Science
|Official Title:||RELVAR Effects on Parasternal Muscle Activity, Diaphragm, and Ventilation in Severe COPD|
- Minute ventilation change [ Time Frame: 2 hours after fluticasone furoate/vilanterol bronchodilator inhalation. ]Minute ventilation will be averaged and compared, before and then 2 hours after the bronchodilator inhalation.
- Parasternal EMG change [ Time Frame: 2 hours after fluticasone furoate/vilanterol bronchodilator inhalation. ]Change in moving averaged, EMG continuously recorded from the parasternal intercostal muscle.
- Pressure change with phrenic stimulation [ Time Frame: 2 hours after fluticasone furoate/vilanterol bronchodilator inhalation. ]Change in recorded mouth pressure during magnetic stimulation of the phrenic nerves.
|Study Start Date:||April 2016|
|Estimated Study Completion Date:||April 2017|
|Estimated Primary Completion Date:||April 2017 (Final data collection date for primary outcome measure)|
Experimental: Fluticasone vilanterol bronchodilator
Inhalation of fluticasone furoate/vilanterol trifenatate, 100 mcg/25 mcg combination, bronchodilator,using standard dry powder inhaler.
Interventions include ventilation, parasternal EMG, and phrenic magnetic stimulation.
Measurements of ventilation with subjects seated, and breathing across a pneumotachygraph and pressure transducer to measure inspiratory airflow, during both resting and CO2 stimulated breathing.Procedure: Parasternal EMG
Recordings of electrical activity (EMG) from the parasternal intercostal muscle in the second intercostal space on the upper anterior chest wall adjacent to the sternum.Procedure: Phrenic magnetic stimulation
Bilateral maximal magnetic stimulation (Magstim) of the phrenic nerves.
In adults with severe, minimally reversible bronchitis or emphysema (COPD), there is progressive hyperinflation of the lungs with associated flattening and inefficiency of the major respiratory muscle, the diaphragm. These changes limit physical activity and exercise, and provoke shortness of breath - dyspnea.
These debilitating symptoms are often significantly lessened with ultra long acting combination bronchodilators, even in adults where the bronchodilator does not produce any measurable improvement in either airflow or lung hyperinflation.
This symptomatic improvement in adults with severe, minimally reversible COPD may occur because of a direct benefit of the bronchodilator on respiratory muscles and ventilation.
This study examines the effect of the ultra long acting bronchodilator fluticasone furoate/vilanterol trifenatate upon the upper anterior chest wall respiratory muscles (parasternals), the diaphragm, and breathing pattern.
Please refer to this study by its ClinicalTrials.gov identifier: NCT02989935
|Contact: Paul A Easton, MD, PhDfirstname.lastname@example.org|
|University of Calgary||Recruiting|
|Calgary, Alberta, Canada, T2N4N1|
|Contact: Paul A Easton, MD, PhD 403-220-7045 email@example.com|
|Principal Investigator:||Paul A Easton, MD, PhD||University of Calgary|