Fig. 1 (abstract P194).From: 38th International Symposium on Intensive Care and Emergency MedicineNomenclature For Analysis of Regional Aeration: I. Supine and II. Prone, where quadrants were defined as: Non-PLEF Dorsal (A); Non-PLEF Ventral (B); PLEF Dorsal (C); and PLEF Ventral (D). III. Lateral position with “Dependent Pleural Effusion”, where quadrants were defined as: Non-PLEF, Non-Dependent Dorsal (A); Non-PLEF, Non-Dependent Ventral (B); PLEF Dependent Dorsal (C); and PLEF Dependent Ventral (D). IV. Lateral position with “Non-Dependent Pleural Effusion”, where quadrants were defined as: Non-PLEF, Dependent Dorsal (A); Non-PLEF, Dependent Ventral (B); PLEF, Non-Dependent Dorsal (C); and PLEF Non-Dependent Ventral (D). PLEF: Pleural Effusion, *: anatomical distribution of PLEFBack to article page