Alveolar oedema manifests as ill-defined nodular opacities tending to confluence (see image with arrows). Interstitial oedema can be seen as peripheral septal lines - Kerley B lines (arrowheads).
|
Grade
|
Description
|
PCWP (mmHg)
|
|
0
|
Normal
|
8 - 12
|
|
1
|
upper zone diversion
|
13 - 18
|
|
2
|
interstitial oedema
|
19 - 25
|
|
3
|
alveolar oedema
|
>25
|
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