Fig. 1
From: Predicting fluid responsiveness in non-intubated COVID-19 patients: two methods are better than one
How to predict fluid responsiveness in non-intubated patients with hypoperfusion and acute respiratory failure (ARF). cIVC collapsibility index of the inferior vena cava with standardized (-st) and unstandardized (-ns) inspiratory manoeuver, COPD chronic obstructive pulmonary disease, PI perfusion index, PLR passive leg raising, VTIao velocity time integral of aortic blood flow