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Effects of Iloprost on Hypoxic Pulmonary Vasoconstriction and Exercise Capacity at High Altitude

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified June 2008 by VA Loma Linda Health Care System.
Recruitment status was:  Recruiting
Information provided by:
VA Loma Linda Health Care System Identifier:
First received: June 30, 2008
Last updated: July 1, 2008
Last verified: June 2008
The objective of this study is to determine if single dose administration of inhaled iloprost will reduce pulmonary artery pressure, reduce hypoxic pulmonary vasoconstriction and improve arterial oxygenation at rest and during exercise at high altitude.

Condition Intervention Phase
Hypoxic Pulmonary Vasoconstriction Drug: iloprost Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Investigator, Outcomes Assessor)
Primary Purpose: Basic Science
Official Title: Effects of Iloprost on Hypoxic Pulmonary Vasoconstriction and Exercise Capacity at High Altitude

Resource links provided by NLM:

Further study details as provided by VA Loma Linda Health Care System:

Primary Outcome Measures:
  • Exercise capacity, pulmonary artery systolic pressure, cardiac output, oxygen saturation [ Time Frame: 6 months ]

Secondary Outcome Measures:
  • Heart rate, tissue Doppler echocardiographic measurements [ Time Frame: 6 months ]

Estimated Enrollment: 50
Study Start Date: July 2008
Estimated Study Completion Date: October 2008
Estimated Primary Completion Date: October 2008 (Final data collection date for primary outcome measure)
Intervention Details:
    Drug: iloprost
    Baseline echo measurements, cardiac output, pulse oximetry will be taken. Subjects will then be given one dose of inhaled iloprost. Post-inhalation, the measurements will be repeated at rest and with exercise.
    Other Name: Ventavis (brand name)
Detailed Description:
Three major pathways in addition to oxygen modulate pulmonary vascular tone: 1) nitric oxide, 2) endothelin, and 3) prostacyclin. Considerable animal data support the role of the prostacyclin pathway in modulating hypoxic pulmonary vasoconstriction. In humans, prostacyclin and its analogs are important therapeutic agents in the treatment of pulmonary arterial hypertension (PAH). Despite the animal data and human data in PAH there is very little information about the use of iloprost to relieve hypoxic pulmonary vasoconstriction in healthy humans. Inhaled iloprost is an ideal agent to study the prostacyclin pathway due to its short duration of action (30-90 min) and elimination half-life of only 20-30 min. Individuals already participating in the Nepal Medex 2008 trip will be invited to participate in this research. Participants will be healthy active females or males, between 18-80 years of age, without known pregnancy or liver disease, who have a readily measurable tricuspid regurgitant velocity by Doppler echocardiography. If possible, we will attempt to identify a cohort of HAPE susceptible patients. Participants will undergo evaluation both at sea level (baseline) and at high altitude. Baseline (low altitude) testing will be performed in Bangor, North Wales, UK, and will include evaluation of pulmonary artery systolic pressures, cardiac output, and oxygen saturation at rest and during submaximal exercise before and after inhalation of iloprost. This strategy will then be repeated at an altitude of approximately 5000 meters in the Dhaulagiri region of Nepal.

Ages Eligible for Study:   18 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  1. Age: 18 - 80 years
  2. Healthy physically active males or females
  3. Have readily measurable tricuspid regurgitation (TR) peak systolic velocity by continuous wave Doppler ultrasound

Exclusion Criteria:

  1. Unable to measure TR velocity
  2. Known liver disease
  3. Pregnancy
  4. Nitrates, cyclosporin, glyburide or other medications that in the opinion of the investigators could place subjects at increased risk of complications
  5. Any other medical condition that in the opinion of the investigators would place the subject at high risk
  Contacts and Locations
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Please refer to this study by its identifier: NCT00708565

United States, California
Jerry L. Pettis VA Medical Center Recruiting
Loma Linda, California, United States, 92357
Contact: James D Anholm, MD    909-583-6098   
Sponsors and Collaborators
VA Loma Linda Health Care System
Principal Investigator: James D Anholm, MD Jerry L. Pettis VA Mecial Center
  More Information

Responsible Party: James D Anholm, MD, VA Loma Linda Healthcare System Identifier: NCT00708565     History of Changes
Other Study ID Numbers: 00769
Study First Received: June 30, 2008
Last Updated: July 1, 2008

Keywords provided by VA Loma Linda Health Care System:
To study the effects of iloprost on hypoxic pulmonary vasoconstriction at high altitude

Additional relevant MeSH terms:
Platelet Aggregation Inhibitors
Vasodilator Agents processed this record on September 21, 2017