Fig. 1From: Causes of acute respiratory failure in patients with small-vessel vasculitis admitted to intensive care units: a multicenter retrospective studyFlowchart. Classification of the cause(s) of acute respiratory failure (ARF). a Analysis of causes of ARF and of survival (n = 121). *Only the first admission was considered. b Analysis of risk factors for non-immune ARF in patients with known Svv (n = 70). Only the most recent episode was considered in the analysis of risk factors for non-immune ARF in patients with known SvvBack to article page