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  • Title: Assessment of functional capacity in patients with chronic obstructive pulmonary disease: correlation between cardiopulmonary exercise, 6 minute walk and 15 step exercise oximetry test.
    Author: Starobin D, Kramer MR, Yarmolovsky A, Bendayan D, Rosenberg I, Sulkes J, Fink G.
    Journal: Isr Med Assoc J; 2006 Jul; 8(7):460-3. PubMed ID: 16889159.
    Abstract:
    BACKGROUND: Different exercise tests are used to evaluate the functional capacity in chronic obstructive pulmonary disease. The cardiopulmonary exercise test is considered the gold standard, but the 6 minute walk and the 15 step exercise oximetry test are considerably less expensive. OBJECTIVES: To determine whether reliable data could be obtained at lower cost. METHODS: The study sample consisted of 50 patients with mild to severe stable COPD. All underwent pulmonary function test and the cardiopulmonary exercise test, 6 minute walk and 15 step exercise oximetry test as part of their regular follow-up visit. Functional capacity was graded according to each test separately and the functional capacities obtained were correlated. RESULTS: The results showed that most of the patients had severe COPD according to pulmonary function tests (mean forced expiratory volume in the first second 46.3 +/- 19.9% of predicted value). There was a good correlation between the cardiopulmonary exercise test and the 6 minute walk functional capacity classes (r = 0.44, P = 0.0013). We did not find such correlation between the 15 step exercise oximetry test and the cardiopulmonary exercise test (r = 0.07, P = 0.64). CONCLUSIONS: The study shows that the 6 minute walk is a reliable and accurate test in the evaluation of functional capacity in COPD patients.
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