Evaluation of preload responsiveness in ARDS patients during prone position is difficult and only one study showed Trendelenburg manoeuvre can be used in this group of patients. This study aims to investigate whether end-expiratory occlusion test, tidal volume challenge (using the changes in PPV) can be used to evaluate preload responsiveness in patients with ARDS ventilated with a low tidal volume and who underwent a PP session.
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Area under ROC curve of the change in pulse pressure variation during tidal volume challenge to detect preload responsiveness
Timeframe: 1 minute after increasing tidal volume from 6 to 8mL/kg