Long - Term Respiratory Rehabilitation Programs in Chronic Obstructive Pulmonary Disease.

To determine whether a long-term maintenance program after respiratory rehabilitation (group active comparator), in contrast to the usual minimal maintenance therapy (group no intervention), improves the cost-effectiveness through: a.- maintaining long term effects in terms of effort capacity, HRQL, and reduced exacerbations b.- reducing the total cost of care to patients, largely through reduction of exacerbations.