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Annals of Intensive Care
Fig. 2 | Annals of Intensive Care

Fig. 2

From: Electrical impedance tomography during spontaneous breathing trials and after extubation in critically ill patients at high risk for extubation failure: a multicenter observational study

Fig. 2

EIT images from three representative patients. Examples of EIT images from three representative patients, two succeeding (a, c) and one failing (b) the SBT. ∆EELI and the inhomogeneity index are shown at baseline, SBT_0 and SBT_30. For ∆EELI, the yellow and blue colour codes indicate EELI loss and increase, respectively. A pink scale code depicts inhomogeneity of gas distribution within the lungs. a Characterized by a relatively small ∆EELI, as referenced to baseline, at both SBT_0 (− 181 ml) and SBT_30 (− 178 ml). The inhomogeneity index is stable, ranging between 35 and 40 in all three trials. In b, conversely, ∆EELI is much greater (− 752 ml at SBT_0 and − 824 ml at SBT_30), indicating a remarkable loss of end-expiratory lung volume at both time points. The pink colour is quite scattered, indicating elevated values of inhomogeneity (54, 72 and 69, at baseline, SBT_0 and SBT_30, respectively). In c, ∆EELI does not significantly change (− 110 ml at SBT_0 and − 117 at SBT_30), while the inhomogeneity index is increased (68, 70 and 71 at baseline, SBT_0 and SBT_30, respectively). Notably, in contrast to the two previous examples, this patient was affected by chronic obstructive pulmonary disease

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