The BLUE-protocol decision tree - performed on dyspneic patients who will be admitted to the ICU The BLUE-protocol combines signs, associates them with a location, resulting in seven profiles: - The A-profile associates anterior lung-sliding with A-lines. - The A’-profile is an A-profile with abolished lung-sliding. - The B-profile associates anterior lung-sliding with lung-rockets. - The B’-profile is a B-profile with abolished lung-sliding. - The C-profile indicates anterior lung…