David B. Badesch, MD, FCCP; Steve H. Abman, MD; Gregory S. Ahearn, MD; Robyn J. Barst, MD; Douglas C. McCrory, MD, MHSc; Gerald Simonneau, MD; and Vallerie V. McLaughlin, MD, FCCP Pulmonary arterial hypertension (PAH) is often difficult to diagnose and challenging to treat. Untreated, it is characterized by a progressive increase in pulmonary vascular resistance leading to right ventricular failure and death. The past decade has seen remarkable improvements in therapy, driven largely by the conduct of randomized controlled trials. Still, the selection of most appropriate therapy is complex, and requires familiarity with the disease process, evidence from treatment trials, complicated drug delivery systems, dosing regimens, side effects, and complications. This chapter will provide evidence-based treatment recommendations for physicians involved in the care of these complex patients. Due to the complexity of the diagnostic evaluation required, and the treatment options available, it is strongly recommended that consideration be given to referral of patients with PAH to a specialized center.
(CHEST 2004; 126:35S-62S)Key words: anticoagulation; arginine; beraprost; bosentan; calcium-channel blockers; endothelin; endothelin receptor antagonist; epoprostenol; idiopathic pulmonary arterial hypertension; iloprost; medical therapy; oxygen; primary pulmonary hypertension; prostacyclin; pulmonary arterial hypertension; pulmonary hypertension; secondary pulmonary hypertension; sildenafil; therapy; treatment; treprostinil; vasoreactivity; warfarin Abbreviations: cAMP ϭ cyclic adenosine monphosphate; CART ϭ combination antiretroviral therapy; CCB ϭ calcium-channel blocker; cGMP ϭ cyclic guanosine 3Ј-5Ј monophosphate; CI ϭ confidence interval; CO ϭ cardiac output; CTEPH ϭ chronic thromboembolic pulmonary hypertension; FDA ϭ Food and Drug Administration; INR ϭ international normalized ratio; IPAH ϭ idiopathic pulmonary arterial hypertension; mPAP ϭ mean pulmonary arterial pressure; NYHA ϭ New York Heart Association; NO ϭ nitric oxide; NOS ϭ nitric oxide synthase; PAH ϭ pulmonary arterial hypertension; PAP ϭ pulmonary arterial pressure; PH ϭ pulmonary hypertension; PPH ϭ primary pulmonary hypertension; PPHN ϭ persistant pulmonary hypertension of the newborn; PVR ϭ pulmonary vascular resistance; RCT ϭ randomized controlled clinical trial H istorically, medical treatment of pulmonary arterial hypertension (PAH) has been difficult. Idiopathic PAH (IPAH), formerly known as primary pulmonary hypertension (PPH), carried a very poor prognosis (median survival of approximately 2.8 years from the date of diagnosis) through the mid-1980s. Since then, a number of therapeutic options have been developed, with varying degrees of evidence to support their use. This chapter will review the current treatment of PAH, objectively detailing the evidence available to support each form of therapy. Some widely used therapies for PAH are generally accepted as being important and efficacious, although not supported by randomized controlled clini...