This study will involve subjects undergoing clinically indicated Right heart catheterization for either idiopathic pulmonary arterial hypertension (IPAH) or heart failure with preserved ejection fraction (HFpEF). The catheter tip utilized in the procedure, which would otherwise be discarded, will be collected and tested. A test performed on the cells adhered to the end of the catheters has been developed which we believe can aid in the differentiation of patients diagnosed with IPAH vs. HFpEF.
Patients with systemic sclerosis (SSc) related pulmonary arterial hypertension (SScPAH) have a worse prognosis than those with idiopathic PAH. We have recently discovered that heart cells in SScPAH do not contract or squeeze as well as in other forms of pulmonary hypertension. However, the mechanism leading to this dysfunction is not understood. To better study this and in hopes of developing a future therapy, we plan to collect tissue samples via a heart biopsy at the time of a clinically indicated heart catheterization.