Effects of Normobaric Hypoxia During Exercise in Patients With Pulmonary Hypertension Receiving Sildenafil (HEXASH)

June 5, 2023 updated by: University of Zurich

Hemodynamic Effects of Acute Normobaric Hypoxia During Exercise in Patients With Pulmonary Hypertension: Single-center Randomized Controlled Trial

To study the effect of acute normobaric hypoxia during exercise in patients with pulmonary hypertension with/without Sildenafil

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.

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.
24

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.
  • Not Applicable

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

  • Switzerland
      • Zurich, Switzerland, 8091
        • UniversityHospital Zurich, Department of Pulmonology

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 and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Informed consent as documented by signature (Appendix Informed Consent Form)
  • PH class I (PAH) or IV (CTEPH) diagnosed according to guidelines: mean pulmonary artery pressure >20 mmHg, pulmonary vascular resistance ≥3 wood units, pulmonary arterial wedge pressure ≤15 mmHg during baseline measures at the diagnostic right-heart catheterization

Exclusion Criteria:

  • resting partial pressure of oxygen <8 kilopascal at Zürich altitude on ambient air
  • exposure to an altitude >1000 m for ≥3 nights during the last 2 weeks before the study
  • inability to follow the procedures of the study
  • patients who take nitrates
  • other clinically significant concomitant end-stage disease (e.g., renal failure, hepatic dysfunction)

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: Single

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.
Experimental: Normobaric hypoxia (FiO2 15%) under Sildenafil
Inhalation of deoxygenated air through an altitude simulator ("Altitrainer"), for approx. 1/2 hour. given by a facemask, first at rest and then during exercise under Sildenafil.
Other: Normobaric hypoxia (FiO2 15%) under Sildenafil
Inhalation of deoxygenated air through an altitude simulator ("Altitrainer"), for approx. 1/2 hour. given by a facemask, first at rest and then during exercise under Sildenafil.
Experimental: Normobaric hypoxia (FiO2 15%)
Inhalation of deoxygenated air through an altitude simulator ("Altitrainer"), for approx. 1/2 hour given by a facemask, first at rest and then during exercise.
Other: Normobaric hypoxia (FiO2 15%)
Inhalation of deoxygenated air through an altitude simulator ("Altitrainer"), for approx. 1/2 hour given by a facemask, first at rest and then during exercise.

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
mean pulmonary artery pressure (mPAP) / cardiac output (CO)
Time Frame: 4 hours
Difference in mPAP/CO during exercise between tests under normoxia with/without Sildenafil
4 hours

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
Differences in pulmonary arterial pressure
Time Frame: 4 hours
Differences in pulmonary arterial pressure at rest and during exercise with/without Sildenafil
4 hours
Differences in cardiac output
Time Frame: 4 hours
Differences in cardiac output at rest and during exercise with/without Sildenafil
4 hours
Differences in pulmonary vascular resistance
Time Frame: 4 hours
Differences in pulmonary vascular resistance at rest and during exercise with/without Sildenafil
4 hours
Differences in pulmonary artery wedge pressure
Time Frame: 4 hours
Differences in pulmonary artery wedge pressure at rest and during exercise with/without Sildenafil
4 hours
Differences in right atrial pressure
Time Frame: 4 hours
Differences in right atrial pressure at rest and during exercise with/without Sildenafil
4 hours
Differences in mixed venous oxygen saturation
Time Frame: 4 hours
Differences in mixed venous oxygen saturation at rest and during exercise with/without Sildenafil
4 hours
Differences in heart rate
Time Frame: 4 hours
Differences in heart rate at rest and during exercise with/without Sildenafil
4 hours
Differences in blood pressure
Time Frame: 4 hours
Differences in blood pressure at rest and during exercise with/without Sildenafil
4 hours
Differences in oxygen saturation
Time Frame: 4 hours
Differences in oxygen saturation at rest and during exercise with/without Sildenafil
4 hours
Differences in arterial blood gases
Time Frame: 4 hours
Differences in arterial blood gases at rest and during exercise with/without Sildenafil
4 hours
Differences in mixed venous blood gases
Time Frame: 4 hours
Differences in mixed venous blood gases at rest and during exercise with/without Sildenafil
4 hours
Differences in cerebral tissue oxygenation
Time Frame: 4 hours
Differences in cerebral tissue oxygenation at rest and during exercise with/without Sildenafil
4 hours
Differences in muscle tissue oxygenation
Time Frame: 4 hours
Differences in muscle tissue oxygenation at rest and during exercise with/without Sildenafil
4 hours
Differences in symptoms (Borg dyspnoea)
Time Frame: 4 hours
Differences in symptoms (Borg dyspnoea) at rest and during exercise with/without Sildenafil
4 hours
Differences in symptoms (Borg leg effort)
Time Frame: 4 hours
Differences in symptoms (Borg leg effort) at rest and during exercise with/without Sildenafil
4 hours

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

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Silvia Ulrich, Prof. Dr., UniversityHospital Zurich, Department of Pulmonology

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.
February 1, 2021

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.
May 31, 2023

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.
May 31, 2023

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).
December 20, 2020

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.
January 5, 2021

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.
January 6, 2021

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.
June 6, 2023

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.
June 5, 2023

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.
May 1, 2022

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.
  • 2020-02163_A3

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

We will share individual participant data after publication of the manuscript. The decision about the platform is ongoing.

IPD Sharing Time Frame

After publication of the manuscript.

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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