Spontaneous versus controlled mechanical ventilation in patients with acute respiratory distress syndrome - protocol for a scoping review.

Aslam, Tayyba Naz; Klitgaard, Thomas Lass; Møller, Morten Hylander; Perner, Anders; Hofsø, Kristin; Skrubbeltrang, Conni; Flaatten, Hilde Iren; Rasmussen, Bodil Steen; Laake, Jon Henrik

BACKGROUND In caring for mechanically ventilated adults with acute respiratory distress syndrome (ARDS), clinicians are faced with an uncertain choice between controlled or spontaneous breathing modes. Observational data indicate considerable practice variation which may be driven by differences in sedation and mobilisation practices. The benefits and harms of either strategy are largely unknown. METHODS A scoping review will be prepared according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) extension for scoping reviews. We will review the clinical literature on controlled versus spontaneous breathing in mechanically ventilated patients with ARDS of any severity. Studies reporting on qualitative and/or quantitative data from any world region will be considered. For inclusion, studies must include data on mechanically ventilated patients with ARDS who are allowed spontaneous (triggered ventilation). Searches will be conducted in four electronic databases without any limitation on publication date and language. We will assess the quality of evidence according to the Grading of Recommendations Assessment, Development and Evaluation (GRADE) methodology, where appropriate. CONCLUSION We will perform a scoping review of the clinical literature on controlled versus spontaneously breathing, mechanically ventilated patients who fulfil ARDS criteria (including acute lung injury). This is to elucidate if a pragmatic clinical trial comparing controlled and spontaneous mechanical ventilation is warranted and will allow us to formulate relevant research questions.