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Pulmonary arterial hypertension (PAH) is a rare obstructive disorder of the smallest pulmonary arteries. Progressive narrowing of these arteries increases pulmonary vascular resistance, resulting in right heart failure and death. Early diagnosis and management can improve prognosis, but diagnosis of PAH in the early stages is a clinical challenge because symptoms such as dyspnea, dizziness, and fatigue are nonspecific. PAH is therefore frequently unrecognized until in a relatively advanced stage.
