INTRODUCTION Pulmonary capillary pressure (PCP), together with the time constants of the various vascular compartments, define the dynamics of the pulmonary vascular system. Our objective in the present study was to estimate PCPs and time constants of the vascular system in patients with idiopathic pulmonary arterial hypertension (IPAH), and compare them with these measures in patients with acu...

BACKGROUND The prevalence and prognostic implications of hypoxemia either at rest or during six-minute walk test (6MWT) in patients with idiopathic or heritable pulmonary arterial hypertension (IPAH or HPAH) have not been systemically studied. OBJECTIVES We sought to determine the prevalence, phenotypic and prognostic implications of hypoxemia in patients with IPAH and HPAH. METHODS Patient...

OBJECTIVE We explored the potential role of the endogenous NO synthase inhibitor asymmetrical dimethylarginine (ADMA) in patients with idiopathic pulmonary arterial hypertension (IPAH). Method and Results- We correlated plasma ADMA levels and cardiovascular indices from right heart catheterization in 57 patients with IPAH. Predictors of survival in patients with IPAH were studied. Furthermore, ...

Idiopathic Pulmonary arterial hypertension (IPAH) is characterized by the obstructive remodelling of pulmonary arteries, and a progressive elevation in pulmonary arterial pressure (PAP) with subsequent right-sided heart failure and dead. Hypoxia induces the expression of peroxisome proliferator activated receptor γ coactivator-1α (PGC-1α) which regulates oxidative metabolism and mitochondrial b...

Insulin resistance, metabolic syndrome, and adipokine dysregulation are now implicated in hypertensive pulmonary vascular disease (1–3). Even in nonobese humans with idiopathic pulmonary arterial hypertension (IPAH), the prevalence of insulin resistance is nearly 50% (1,2), suggesting a link between glucose dysregulation and IPAH. Additionally, IPAH develops spontaneously in animal models of ob...

BACKGROUND To study the oxygen uptake efficiency and determine usefulness of submaximal parameters of oxygen uptake in systemic lupus erythematosus associated pulmonary arterial hypertension (SLE PAH) on performing a cardiopulmonary exercise test (CPET). METHODS CPET was performed in 21 SLE PAH patients, equal number of idiopathic pulmonary arterial hypertension (IPAH) patients and controls. ...

BACKGROUND Idiopathic pulmonary arterial hypertension (IPAH) is a rare, fatal disease of unknown pathogenesis. Evidence from our recent study suggests that IPAH pathogenesis is related to upregulation of the Wnt/planar cell polarity (Wnt/PCP) pathway. We used microscopic observation and immunohistochemical techniques to identify expression patterns of cascading proteins-namely Wnt-11, dishevell...

BACKGROUND Idiopathic pulmonary arterial hypertension (IPAH) is a fatal disorder with a prevalence of 8.6 per million. We introduce a registry website for IPAH and PAH patients ( www.IPAH.ir) for access and efficient delivery of government-aided and subsidized antihypertensive medications. MATERIALS AND METHODS The IPAH registry was opened in November 2009. Information of IPAH and PAH patient...

BACKGROUND Schistosomiasis associated pulmonary arterial hypertension (Sch-PAH) might represent the most prevalent form of PAH worldwide. In Sch-PAH, the presence of aneurismal dilation of the pulmonary artery has been described, although it is still a matter of debate whether on average the pulmonary artery is more enlarged in Sc-PAH than IPAH. METHODS We retrospectively evaluated patients w...

Introduction: Systemic sclerosis (SSc) complicated by pulmonary arterial hypertension (PAH) carries a poor prognosis, despite pulmonary vascular dilating therapy. Platelet-derived growth factor receptor-b (PDGFR-b) and epidermal growth factor receptor (EGFR) are potential therapeutic targets for PAH because of their proliferative effects on vessel remodelling. To explore their role in SScPAH, w...