Altitude Hypoxia
Conditions
Keywords
healthy participants older than 40 years, right heart function during exercise, prevention, acetazolamide
Brief summary
Randomized, placebo controlled trial evaluating efficacy of acetazolamide on right heart function during exercise in lowlanders older than 40 years travelling from 760 m to 3'100 m.
Detailed description
This is a randomized, placebo-controlled, double-blind parallel trial evaluating the efficacy of acetazolamide prophylaxis on right heart function during exercise in lowlanders older than 40 years 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 (3'100 m), and stay there for 2 days. Acetazolamide 375mg/day (or placebo), will be administered before departure at 760 m and during the stay at altitude. Outcomes will be assessed during the stay at 3'100 m. An interim analysis will be carried out when 200 participants will have completed the study and/or after the first year. The Peto's method will be used and the trial will be stopped when pre-specified futility boundaries were crossed.
Interventions
Administration of 1x125mg acetazolamide in the morning, 2x125mg in the evening, starting 24 hours before departure to 3'100m
DRUGPlacebo oral capsule
Administration of equally looking placebo capsules in the morning and evening, starting 24 hours before departure to 3'100m
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
40 Years to 75 Years
Healthy volunteers
Yes
Inclusion criteria
* Healthy men and women, age 40-75 yrs, without any disease and need of medication. * Born, raised and currently living at low altitude (\<800m). * Written informed consent. * Kyrgyz ethnicity
Exclusion criteria
* Any active respiratory, cardiovascular or other disease requiring regular treatment or being otherwise relevant for tolerance of hypoxia or altitude exposure. * Any condition that may interfere with protocol compliance including current heavy smoking (\>20 cigarettes per day or \>20 pack-years with active smoking during the last 10 years), regular use of alcohol. * Allergy to acetazolamide and other sulfonamides.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| pulmonary artery pressure (PAP) during exercise | Day 2 at 3100m | 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 3100 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 (CO) during exercise | Day 2 at 3100m | 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 |
| cardiac output during exercise | Day 2 at 760 m and 3100 m | Difference in altitude-induced change of cardiac output during exercise between acetazolamide and placebo group, measured by transthoracic echocardiography during graded cycling on an ergometer |
| PAP/CO slope during exercise | Day 2 at 3100m | 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 at 3100m | 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