Pulmonary - Lung Sliding and A-lines
Caption
Lung Sliding and a-lines This is a clip demonstrating lung sliding. The most superficial hyperechoic layers are the soft tissue and muscular layers of the chest wall. Immediately deep to that is a bright, thin hyperechoic line which appears to be in motion - this is the pleural line. The parietal pleura rubbing against the visceral pleura as the patient breathes creates this shimmery appearance of lung sliding also often described as “ants marching”. The next horizontal hyperechoic line deep to the pleura is an a-line; this is a reverberation artifact created by a reflection of the pleura. The presence of a-lines is a normal finding.