Asthma Clinical Trial
Official title:
Examination of the Bronchoprotective Effect of Endothelin Receptor Blockade in Asthma
The purpose of this study will be to determine if blockade of endothelin 1 signalling via endothelin receptor A using ambrisentan or dual blockade (A&B) via bosentan can provide protection against methacholine induced bronchoconstriction in asthma.
Endothelin 1 may have a role in the development of acute airway narrowing in asthma. Blockade of the endothelin system may thereby protect against airway narrowing. Two receptors exist for endothelin 1, Endothelin A & B. Both can be blocked by Bosentan, and the A receptor by ambrisentan. Both medications are currently in use for the treatment of pulmonary arterial hypertension. The investigators will endeavour to examine the potential role of endothelin 1 in the development of airway narrowing in asthma through blockade of the endothelin receptors A&B through the use of bosentan and ambrisentan. ;
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment
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