Physician-diagnosed COPD global initiative for chronic obstructive lung disease stage IV in Ostersund, Sweden: Patient characteristics and estimated prevalence.

Abstract

BACKGROUND The prevalence of COPD is estimated to 4 to 14%. According to the Global Initiative for Chronic Obstructive Lung Disease guidelines, COPD is divided into four stages. Patients with stage IV disease (very severe) have FEV1 < 30% of predicted values and/or respiratory insufficiency. The few studies that exist have reported a stage IV disease… (More)

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