Subterranean Pulmonary Rehabilitation in Chronic Obstructive Pulmonary Disease

Pulmonary rehabilitation (PR) has been recommended as an integral part of treatment for patients with chronic obstructive pulmonary disease (COPD). Climate therapy in salt mine chambers has been found of benefit in chronic respiratory diseases. The study compares long-term effects of underground PR in the Wieliczka Salt Mine with that conducted on the surface. There were 42 COPD patients enrolled in the study, with FEV₁/FVC <0.7 predicted and post-bronchodilator reversibility <12%, randomized into pulmonary rehabilitation in the mine (Group I, n = 23) and PR on the surface (Group II, n = 19). The outcomes consisted of lung function variables, exercise performance (6-min walk test - 6MWT), dyspnea (mMRC), and compliance with the disease and quality of life (COPD Assessment Test - CAT) and BODE index, compared at baseline (P0), end (P1), and 6 months after pulmonary rehabilitation (P2). The findings were that subterranean pulmonary rehabilitation significantly reduced CAT score (p < 0.001), BODE index (p = 0.004), and dyspnea (mMRC) (p = 0.001) and increased distance in 6MWT (p < 0.001), compared with its equivalent conducted on the surface. Further, beneficial effect of subterranean treatment was sustained during the following half a year as opposed to the effect noticed on patients treated on the surface. We conclude that subterranean pulmonary rehabilitative treatment reduces symptoms and improves exercise tolerance to a greater and sustained extent, compared to a similar treatment on the surface, in patients suffering from COPD.