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OpenTrials
Completed

NCT Number: NCT00105209

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.

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Key information

Conditions

Hypertension, Pulmonary Cardiovascular Diseases Hypertension Lung Diseases Respiratory Tract Diseases Vascular Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 2

Primary location

Columbia University College of Physicians and Surgeons, New York, United States

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About this study

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).

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Diagnosis of IPAH
  • ≥ 18 years of age
  • NYHA functional class I, II, or III
  • Clinical stability (i.e., without change in pulmonary arterial hypertension medical regimen within one month prior to enrollment).

Exclusion criteria

  • Other forms of PAH
  • A contraindication to ASA or clopidogrel
  • Thrombocytopenia (defined as platelet count ≤ 75,000)
  • History of intracranial hemorrhage or chronic thromboembolic disease
  • Renal failure
  • Inability or unwillingness to avoid non-steroidal anti-inflammatory agents, ASA, or warfarin use for the duration of the trial

Treatment and study plan

Aspirin

Drug

clopidogrel

Drug

Primary outcomes

  1. Plasma P-selectin level

  2. Aggregometry

  3. Serum thromboxane B2

  4. Urinary Tx-M

  5. Urinary prostaglandin I2 (PGI-M)

Secondary outcomes

  1. Adverse events

Sponsors and collaborators

Lead sponsor

Kawut, Steven, MD

Indiv

Collaborators

  • Columbia University
  • National Heart, Lung, and Blood Institute (NHLBI)

Registry information

Official study title

A Double-Blind, Placebo-Controlled, Three Treatment Cross-Over Study of Aspirin and Clopidogrel in Patients With Idiopathic Pulmonary Arterial Hypertension

Important dates

Study start
2002
Study completion
2003
First posted
Mar 10, 2005
Registry last updated
Jun 24, 2005

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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