Chronic Obstructive Pulmonary Disease
Conditions
Keywords
exercise, echocardiography, right ventricular function, obstructive airway disease, emphysema, acetazolamide, altitude
Brief summary
This trial will evaluate the effect of acetazolamide (375 mg per day) vs. placebo on right ventricular function during exercise at acute altitude exposure in patients with COPD.
Detailed description
This is a randomized, placebo-controlled, double-blind parallel trial evaluating the effect of acetazolamide (375 mg per day) vs. placebo on right ventricular function during exercise in lowlanders with chronic obstructive pulmonary disease travelling to altitude. Participants living in the Bishkek area, Kyrgyzstan (760m), will be transferred by car within 4h to the Tuja Ashu high altitude clinic (3200 m), and stay there for 2 days. Acetazolamide 375mg/day (or placebo) will be administered 24 hours before departure at 760 m and during the stay at altitude. Outcomes will be assessed during the stay at 3200 m. Right ventricular function will be assessed during graded cycling on an ergometer by transthoracic echocardiography.
Interventions
Administration of 125mg acetazolamide in the morning, 250mg in the evening, starting 24 hours before departure to 3200m
DRUGPlacebo oral capsule
Administration of equally looking placebo capsules in the morning and evening, starting 24 hours before departure to 3200m
Sponsors
National Center of Cardiology and Internal Medicine named after academician M.Mirrakhimov
University of Zurich
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
* Male and female patients, age 18-75 yrs. * COPD diagnosed according to GOLD, FEV1 40-80% predicted, SpO2 ≥92% at 750 m. * Born, raised and currently living at low altitude (\<800m). * Written informed consent.
Exclusion criteria
* COPD exacerbation, very severe COPD with hypoxemia at low altitude (FEV1/FVC \<0.7, FEV1 \<40% predicted, oxygen saturation on room air \<92% at 750 m). * Comorbidities such as uncontrolled cardiovascular disease, i.e., unstable systemic arterial hypertension, coronary artery disease; previous stroke; OSA; pneumothorax in the last 2 months. * Internal, neurologic, rheumatologic or psychiatric disease including current heavy smoking (\>20 cigarettes per day) * Known renal failure or allergy to acetazolamide and other sulfonamides
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| pulmonary artery pressure during exercise | Day 2 at 3200m | Difference in change of tricuspid pressure gradient during exercise between acetazolamide and placebo group at altitude, measured by transthoracic echocardiography during graded cycling on an ergometer |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| pulmonary artery pressure during exercise | Day 2 at 760 m and 3200 m | Difference in altitude-induced change of tricuspid pressure gradient during exercise between acetazolamide and placebo group, measured by transthoracic echocardiography during graded cycling on an ergometer |
| cardiac output during exercise | Day 2 at 3200m | Difference in change of cardiac output during exercise between acetazolamide and placebo group at altitude, measured by transthoracic echocardiography during graded cycling on an ergometer |
| PAP/CO slope during exercise | Day 2 at 3200m | Difference in change of PAP/CO slope during exercise between acetazolamide and placebo group at altitude, measured by transthoracic echocardiography during graded cycling on an ergometer |
| Oxygen saturation | Day 2 and 3200 m | Difference in altitude-induced change during exercise of oxygen saturation between acetazolamide and placebo group, measured by pulse oximeter |
Countries
Kyrgyzstan
Outcome results
None listed