The PAH Guide provides an overview of published guidelines on the pathology, diagnosis, and treatment of pulmonary arterial hypertension (PAH). PAH is a complex and rapidly progressing disease involving the pulmonary arteries, lungs, and heart. Patients with PAH typically experience breathlessness, reduced exercise capacity, fatigue, and eventual right heart failure. Brought to you by Actelion Pharmaceuticals, a leader in the PAH community, the PAH Guide was developed to be a convenient reference for healthcare providers. Note: May not be downloaded by healthcare professionals from states that have legal restrictions on gifts.