The diagnosis of COPD can be frustrating for both the patient and the physician, especially when a patient is identified as having the frequent-exacerbation phenotype. Counseling these patients is ...

1. Clinical Practice Guidelines Group. Diagnosis and management of pulmonary arterial hypertension: ACCP evidence-based clinical practice guidelines. Chest 2004; 126(Suppl):1S 92S This statement ...

Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives.

Background Many studies show a link between forced expiratory volume in 1 s (FEV 1) and survival in the general population and this has been interpreted as a link between airway obstruction and ...