Table 2.

Quantification of re-aeration and loss of aeration by the observation of changes of the LUS pattern in each of the 12 chest areas. The final score is the sum of the 12 areas

Re-aeration score	Loss of aeration score
+ 1 point	+ 3 points	+ 5 points	− 5 points	− 3 points	− 1 point
B1 to Normal	B2 to Normal	C to Normal	Normal to C	Normal to B2	Normal to B1
B2 to B1	C to B1			B1 to C	B1 to B2
C to B2					B2 to C

B1: multiple separated B-lines; B2: coalescent B-lines or light beam; C: consolidation