COPD - Diagnosis and treatment - Mayo Clinic

cop4dEnd stage chronic obstructive pulmonary disease (COPD), also referred to as stage 4 COPD, is the most severe stage of the condition. It can cause symptoms such asChronic obstructive pulmonary disease (COPD) is estimated to affect 32 million persons in the United States and is the third leading cause of death in this country. Patients typically have