This book provides an overview of pulmonary hypertensive diseases, the current understanding of their pathobiology, and a contemporary approach to diagnosis and treatment. It discusses the definition and classification of these disorders and the epidemiology of pulmonary arterial hypertension (PAH); explores the approach to diagnosis and evaluation via methods such as echocardiography, right heart catheterization, and cardiopulmonary exercise testing; describes the major drug classes used to treat PAH and the cell signaling pathways that they target as well as adjunct and investigative...