Effect of Acetazolamide on Right Ventricular Function at Rest in Patients With Respiratory Disease at Altitude

August 12, 2019 updated by: University of Zurich

Effect of Acetazolamide on Right Ventricular Function at Rest in Patients With Chronic Obstructive Pulmonary Disease at Altitude. A Randomized, Placebo-controlled, Double-blind Parallel Trial

This trial will evaluate the effect of acetazolamide (375 mg per day) vs. placebo on right ventricular function at acute altitude exposure in patients with COPD.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

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 at rest 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 by transthoracic echocardiography.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
110

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Kyrgyzstan
      • Bishkek, Kyrgyzstan, 720040
        • National Center for Cardiology and Internal Medicine

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

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

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: ACETAZOLAMIDE oral capsule
Acetazolamide 375mg/day (capsule @125 mg: 1 in the morning, 2 in the evening), orally. Medication starts 24 hours before ascent to 3200m until the morning after the second night at 3200m
Drug: ACETAZOLAMIDE oral capsule
Administration of 125mg acetazolamide in the morning, 250mg in the evening, starting 24 hours before departure to 3200m
Placebo Comparator: PLACEBO oral capsule
Placebo (capsules identically looking as acetazolamide capsules: 1 in the morning, 2 in the evening), orally. Medication starts 24 hours before ascent to 3200m until the morning after the second night at 3200m.
Drug: Placebo oral capsule
Administration of equally looking placebo capsules in the morning and evening, starting 24 hours before departure to 3200m

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
pulmonary artery pressure
Time Frame: Day 2 at 760m and 3200m
Difference in altitude-induced change of pulmonary artery pressure (PAP) between acetazolamide and placebo group, measured by transthoracic echocardiography (tricuspid pressure gradient and pulmonary valve acceleration time)
Day 2 at 760m and 3200m

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
pulmonary artery pressure
Time Frame: Day 2 at 3200m
Difference at altitude of pulmonary artery pressure (PAP) between acetazolamide and placebo group, measured by transthoracic echocardiography (tricuspid pressure gradient and pulmonary valve acceleration time)
Day 2 at 3200m
cardiac output
Time Frame: Day 2 at 760m and 3200m
Difference in altitude-induced change of cardiac output between acetazolamide and placebo group, measured by transthoracic echocardiography
Day 2 at 760m and 3200m
cardiac output
Time Frame: Day 2 at 3200m
Difference at altitude between acetazolamide and placebo group in cardiac output, measured by transthoracic echocardiography
Day 2 at 3200m
right heart dimensions
Time Frame: Day 2 at 760m and 3200m
Difference in altitude-induced change of right heart dimensions between acetazolamide and placebo group, measured by transthoracic echocardiography
Day 2 at 760m and 3200m
right heart dimensions
Time Frame: Day 2 at 3200m
Difference at altitude of right heart dimensions between acetazolamide and placebo group, measured by transthoracic echocardiography
Day 2 at 3200m
right heart function
Time Frame: Day 2 at 760m and 3200m
Difference in altitude-induced change of right heart function between acetazolamide and placebo group, measured by transthoracic echocardiography (TAPSE)
Day 2 at 760m and 3200m
right heart function
Time Frame: Day 2 at 3200m
Difference at altitude of right heart function between acetazolamide and placebo group, measured by transthoracic echocardiography (TAPSE)
Day 2 at 3200m
stroke volume
Time Frame: Day 2 at 760m and 3200m
Difference in altitude-induced change of stroke volume between acetazolamide and placebo group, measured by transthoracic echocardiography
Day 2 at 760m and 3200m
stroke volume
Time Frame: Day 2 at 3200m
Difference at altitude between acetazolamide and placebo group in stroke volume, measured by transthoracic echocardiography
Day 2 at 3200m
volumes
Time Frame: Day 2 at 760m and 3200m
Difference in altitude-induced change of volumes between acetazolamide and placebo group, measured by transthoracic echocardiography
Day 2 at 760m and 3200m
volumes
Time Frame: Day 2 at 3200m
Difference at altitude of volumes between acetazolamide and placebo group, measured by transthoracic echocardiography
Day 2 at 3200m

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University of Zurich

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
National Center of Cardiology and Internal Medicine named after academician M.Mirrakhimov

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 24, 2017

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
August 2, 2018

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
August 2, 2018

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 23, 2017

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 31, 2017

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
June 1, 2017

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 14, 2019

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 12, 2019

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2019

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2017-00137E

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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