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* From the Departments of Pulmonary (Drs. Casanova, Soriano, Velasco, and Santolaria), Psychiatry (Dr. Tost), and Cardiology (Dr. Abreu), Hospital La Candelaria, Department of Pulmonary and Internal Medicine, Hospital Universitario de Canarias, Tenerife, Spain; and Department of Pulmonary and Critical Care Medicine (Dr. Celli), St. Elizabeths Medical Center, Tufts University School of Medicine, Boston, MA.
Correspondence to: Bartolome R. Celli, MD, FCCP, Pulmonary and Critical Care Division, St. Elizabeths Medical Center, 736 Cambridge St, Boston, MA 02135; e-mail: bcelli{at}semc.org
Study objectives: To determine the 1-year efficacy of noninvasive positive pressure ventilation (NPPV) added to long-term oxygen therapy (LTOT) in patients with stable severe COPD.
Patient selection and methods: We prospectively randomized 52 patients with severe COPD (FEV1 < 45%) to either NPPV plus "standard care" (96% patients with LTOT) or to standard care alone (93% patients with LTOT). The outcomes measured included the following: rate of acute COPD exacerbations; hospital admissions; intubations; and mortality at 3 months, 6 months, and 12 months. The patients were also evaluated at 3 months and 6 months for dyspnea using the Medical Research Council and Borg scales, gas exchange, hematocrit, pulmonary function, cardiac function with echocardiogram, and neuropsychological performance.
Results: One-year survival was similar in both groups (78%). The number of acute exacerbations was similar at all time points in patients receiving NPPV, compared with control subjects. The number of hospital admissions was decreased at 3 months in the NPPV group (5% vs 15% of patients, p < 0.05), but this difference was not seen at 6 months (18% vs 19%, respectively). The only beneficial differences were observed in the Borg dyspnea rating, which dropped from 6 to 5 (p < 0.039), and in one of the neuropsychological tests (psychomotor coordination) for the NPPV group at 6 months.
Conclusions: Our study indicates that over 1 year, NPPV does not affect the natural course of the disease and is of marginal benefit in outpatients with severe COPD who are in stable condition.
Key Words: COPD noninvasive mechanical ventilation respiratory failure
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