Metadata about: BACKGROUND: Intensive care unit (ICU)-acquired weakness and diaphragm dysfunction are frequent conditions, both associated with poor prognosis in critically ill patients. While it is well established that ICU-acquired weakness severely impairs long-term prognosis, the association of diaphragm dysfunction with this outcome has never been reported. This study investigated whether diaphragm dysfunction is associated with negative long-term outcomes and whether the coexistence of diaphragm dysfunction and ICU-acquired weakness has a particular association with 2-year survival and health-related quality of life (HRQOL). METHODS: This study is an ancillary study derived from an observational cohort study. Patients under mechanical ventilation were enrolled at the time of their first spontaneous breathing trial. Diaphragm dysfunction was defined by tracheal pressure generated by phrenic nerve stimulation < 11 cmH(2)O and ICU-acquired weakness was defined by Medical Research Council (MRC) score < 48. HRQOL was evaluated with the SF-36 questionnaire. RESULTS: Sixty-nine of the 76 patients enrolled in the original study were included in the survival analysis and 40 were interviewed. Overall 2-year survival was 67% (46/69): 64% (29/45) in patients with diaphragm dysfunction, 71% (17/24) in patients without diaphragm dysfunction, 46% (11/24) in patients with ICU-acquired weakness and 76% (34/45) in patients without ICU-acquired weakness. Patients with concomitant diaphragm dysfunction and ICU-acquired weakness had a poorer outcome with a 2-year survival rate of 36% (5/14) compared to patients without diaphragm function and ICU-acquired weakness [79% (11/14) (p < 0.01)]. Health-related quality of life was not influenced by the presence of ICU-acquired weakness, diaphragm dysfunction or their coexistence. CONCLUSIONS: ICU-acquired weakness but not diaphragm dysfunction was associated with a poor 2-year survival of critically ill patients.

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