Pulmonary hypertension is a progressive and life threatening condition. It is characterized by severe remodeling of the pulmonary vessel wall, obstructive plexiform lesions, multi-focal thrombosis, and enhanced vasoconstriction. All of these characteristics contribute to increased pulmonary vascular resistance.

Circulating endothelial microparticles (EMPs) play an integral role in the pathogenesis and perpetuation of pulmonary hypertension. Levels of EMPs are considered a reliable biological parameter of endothelial injury.

We propose to assess the evolution of both circulating and pulmonary venous EMPs in patients with PH. Assessments will be made before and after initiation of Endothelin-1 (ET-1) Receptor blocker therapy, and correlated to their patterns with the changes in mean PAP, the 6 Minutes Walking Distance test, and circulating Endothelin-1 values. Measurements of the endothelial microparticle circulating levels (assessed by flow cytometry methods) will be made before, 1 month and 3 months after initiation of therapy.

Inclusion Criteria:

• Patient's + 18 years with suspected pre-capillary pulmonary hypertension
• Prescribed Endothelial - 1 receptor blocker

Exclusion Criteria:

• Currently taking endothelium-active vasodilator therapy.
• Hemoglobin and / or hematocrit level blood the lower normal limit.
• Left ventricle dysfunction (LVEF <50%)
• LV end-diastolic pressure > 15 mmHg)
• Recent history (<3 months) of pulmonary embolism
• Liver failure or abnormal liver function tests; aortic or mitral regurgitation or stenosis
• Current medication with endothelin-1 receptor antagonist, prostacyclin analogues or type 5 phosphodiesterase inhibitors.
• Subjects with conditions known to be associated with an increase in circulating endothelial microparticle numers, such as chronic renal failure (Creatinine Clearance < 50 ml/min/m2) acute coronary syndromes and uncontrolled system hypertension.

Precapillary Pulmonary Hypertension