A Study of Aspirin and Clopidogrel in Patients With Idiopathic Pulmonary Arterial Hypertension
Rationale: Idiopathic pulmonary arterial hypertension (IPAH) is characterized by in situ thrombosis and increased thromboxane A2 (Tx-M) synthesis. While both may be attributable to abnormal platelet function, there are no studies of anti-platelet therapy in IPAH.
Objectives: The purpose of this study is to assess the effects of aspirin (ASA) and clopidogrel on platelet function and eicosanoid metabolism in patients with IPAH.
|Study Design:||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Crossover Assignment
Primary Purpose: Treatment
|Official Title:||A Double-Blind, Placebo-Controlled, Three Treatment Cross-Over Study of Aspirin and Clopidogrel in Patients With Idiopathic Pulmonary Arterial Hypertension|
- Plasma P-selectin level
- Serum thromboxane B2
- Urinary Tx-M
- Urinary prostaglandin I2 (PGI-M)
- Adverse events
|Study Start Date:||April 2002|
|Estimated Study Completion Date:||December 2003|
This is a randomized, double-blind, placebo-controlled crossover study of aspirin 81 mg once daily and clopidogrel 75 mg once daily. Platelet function is assessed with plasma P-selectin levels and aggregometry after exposure to adenosine diphosphate, arachidonic acid, and collagen. We will assess serum levels of thromboxane B2 and urinary metabolites of thromboxane A2 and prostaglandin I2 (Tx-M and PGI-M, respectively).
|United States, New York|
|Columbia University College of Physicians and Surgeons|
|New York, New York, United States, 10032|
|United States, Tennessee|
|Vanderbilt University Medical Center|
|Nashville, Tennessee, United States, 37232|