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The article discusses the study which involves the six-minute walk test (6MTW) and cardiopulmonary exercise testing (CPET) to assess the functional limitations of patients with heart failure (HF) at the Sao Paolo Hospital in Brazil. It notes that the study compared the clinical and prognostic validity of the two techniques to determine the health status of the patients with HP. It concludes that 6MWT confirms to be simple and reliable but no evidence of usage as a prognostic marker.