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===[[Ultrasound: Lungs|Lung ultrasound]] of [[pulmonary edema]]===
[[File:B-lines.png|thumb|Lung ultrasound showing pulmonary edema.]]
*A lines and B lines
**A lines:
***Appear as horizontal lines 
***Indicate dry interlobular septa. 
***Predominance of A lines has 90% sensitivity, 67% specificity for pulmonary artery wedge pressure <= 13mm Hg
***A line predominance suggests that intravenous fluids may be safely given without concern for pulmonary edema
**B lines ("comets"): 
***White lines from the pleura to the bottom of the screen
***Highly sensitive for pulmonary edema, but can be present at low wedge pressures