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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT00432978
Other study ID # 00534
Secondary ID Prom: 0030
Status Completed
Phase Phase 1
First received February 6, 2007
Last updated April 17, 2007
Start date July 2006
Est. completion date February 2007

Study information

Verified date April 2007
Source VA Loma Linda Health Care System
Contact n/a
Is FDA regulated No
Health authority United States: Federal Government
Study type Interventional

Clinical Trial Summary

This study is to determine whether bosentan will alter exercise capacity after rapid ascent to high altitude.

We hypothesize that bosentan administration will improve arterial oxygenation and exercise capacity.


Description:

Both the prostacyclin and the nitric oxide pathways are important in modulating hypoxic pulmonary vasoconstriction (HPV). There is little information about the role of the endothelin pathway at high altitude. The endothelin pathway involves the activation of two distinct receptors, A and B. Bosentan is a nonpeptide, specific, competitive, dual antagonist of both endothelin receptor subtypes. The primary objective of this study will be to determine the effect of endothelin receptor blockade with bosentan on exercise performance and HPV. This is a prospective, double blind, placebo-controlled, randomized cross-over study involving healthy subjects aged 25-55 years of age. Subjects will undergo echocardiography and exercise testing at low altitude (< 500m) and at 3800m. Subjects will receive either bosentan vs. placebo and will be studied at low and high altitude on two occasions in a crossover design. Primary outcome measures will be pulmonary artery systolic pressure measured by echo-Doppler and exercise capacity. A better understanding of the role of the endothelin pathway in HPV may lead to improved treatments for some patients.


Recruitment information / eligibility

Status Completed
Enrollment 20
Est. completion date February 2007
Est. primary completion date
Accepts healthy volunteers Accepts Healthy Volunteers
Gender Both
Age group 18 Years to 55 Years
Eligibility Inclusion Criteria:

- Normal healthy subjects aged 18 - 55 years

Exclusion Criteria:

- Pregnancy

- Heart, lung or liver disease

- Use of glyburide, cyclosporin A

Study Design

Allocation: Randomized, Endpoint Classification: Pharmacodynamics Study, Intervention Model: Crossover Assignment, Masking: Double-Blind, Primary Purpose: Treatment


Related Conditions & MeSH terms


Intervention

Drug:
Bosentan administration


Locations

Country Name City State
United States VA Loma Linda Healthcare System Loma Linda California

Sponsors (2)

Lead Sponsor Collaborator
VA Loma Linda Health Care System Actelion

Country where clinical trial is conducted

United States, 

Outcome

Type Measure Description Time frame Safety issue
Primary Exercise Capacity
Primary Pulmonary artery systolic pressure
Secondary Hemoglobin oxygen saturation
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