ABCs of Lung Ultrasound - A-Lines, B-Lines, Consolidation
A-Profile - Air filled lung does not transmit sound waves, leading to A-line (reverberation) artifact
B-Profile - Interstitium widens to allow propagation of ultrasound beams past the pleural interface
C-Profile - Filled alveoli lead to a consolidated portion of lung (not air-filled)
 • If bronchioles are air filled: static air bronchograms will be seen
 • If bronchioles are partially fluid filled: dynamic air bronchograms may be seen
 • If bronchioles are fluid filled: fluid bronchograms may be seen
C-Profile - Collapsed alveoli lead to a consolidated portion of lung (not air-filled)
 • If bronchioles are completely collapsed: no air bronchograms will be seen
 • If bronchioles are open or partially collapsed: static air bronchograms will be seen

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