Clinical trial NCT03540901: Effect of Acetazolamide on Lung Water Content by Ultrasound in Patients With Respiratory Disease at Altitude
Official title: Effect of Acetazolamide on Lung Water Content by Ultrasound in Patients With Respiratory Disease at Altitude: A Randomized, Placebo-controlled, Double-blind Parallel Trial
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE4
Conditions: Chronic Obstructive Pulmonary Disease
Keywords: prevention
acetazolamide
obstructive airway disease
lung water
Lead sponsor: University of Zurich
Sponsor class: OTHER
Collaborators: name: National Center of Cardiology and Internal Medicine named after academician M.Mirrakhimov
First posted: 2018-05-30
Enrollment: 112
Sex: ALL
Minimum age (years): 18
Maximum age (years): 75
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: This trial will evaluate the effect of acetazolamide (375 mg per day) vs. placebo on lung water content by ultrasound at acute altitude exposure in patients with Chronic Obstructive Pulmonary Disease (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 lung water content by ultrasound 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 (3100 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 3100 m.

Eligibility criteria: Inclusion Criteria:

* Male and female patients, age 18-75 yrs.
* COPD diagnosed according to GOLD, FEV1 40-80% predicted, Oxygen Saturation (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/Forced Vital Capacity \<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; obstructive sleep apnea; 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

Primary outcomes:
measure: Difference in change of ultrasound lung comets from 760 m baseline measurement to measurement at 3100 m in the acetazolamide compared to the placebo group
timeFrame: Day 2 at 760m and 3100m
Secondary outcomes:
measure: Change of ultrasound lung comets from 760 m baseline measurement to measurement at 3100 m in the acetazolamide and in the placebo group, respectively
timeFrame: Day 2 at 3100m
Other outcomes:
Locations:
city: Biskek
country: Kyrgyzstan
facility: National Center of Cardiology and Internal Medicine
Study officials:
affiliation: University Hospital, Zürich
name: Konrad E Bloch, MD
role: STUDY_CHAIR
affiliation: National Center of Cardiology and Internal Medicine, Bishkek, Kyrgyzstan
name: Talant M Sooronbaev, MD
role: STUDY_DIRECTOR
affiliation: University Hospital, Zürich
name: Michael Furian, MSc
role: PRINCIPAL_INVESTIGATOR
affiliation: University Hospital, Zürich
name: Silvia Ulrich, MD
role: PRINCIPAL_INVESTIGATOR
References: