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Pneumoperitoneum - Free Air Reverberation Artifact - Abdominal A-Lines on POCUS Don't just look for FF on fast. Free air is reverberation artifact with abdominal a-lines. POCUS Dx made in 1 min...xr done 15 mins later. Eric Abrams, MD @eabramsMD #Pneumoperitoneum #FreeAir #Reverberation #Artifact #Abdominal #ALines #POCUS #clinical #ultrasound