Table 1.

Histologic lung injury results

	Score per field
Parametera	1	2	3
A. Neutrophils in the alveolar space	None	1–5	> 5
B. Neutrophils in the interstitial space	None	1–5	> 5
C. Hyaline membranes	None	1	> 1
D. Proteinaceous debris filling the airspaces	None	1	> 1
E. Alveolar septal thickening	< 2×	2×–4X	>4×
F. Alveolar congestion	None	1–5	> 5

^aLung injury scoring system [adapted from Matute-Bello et al.¹⁸].