The 6-Minute Walk Test as a Tool for Determining Exercise Capacity and Prognosis in Patients with Silicosis

To evaluate exercise capacity using the 6-minute walk test (6MWT) in patients with complicated silicosis, and to determine how results shape the prognostic value of 6MWT for hospitalization and mortality. Prospective observational study in 143 patients with complicated silicosis who performed the 6MWT in our outpatient pulmonology clinic between 2009 and the end of 2016. Lung function tests, computed tomography findings and 6MWT parameters (distance walked and oxygen desaturation) were evaluated. Patients with complicated silicosis walked 387±92m. Results deteriorated as silicosis severity increased; category A: 407±97m, B: 370±88m, and C: 357±68m (P=.022). The 6MWT correlated positively with lung function and inversely with dyspnea determined by mMRC (P