Pneumothorax and the A′-profile.

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Pneumothorax and the A′-profile. Pneumothorax and the A′-profile. The A′-profile is defined anteriorly in supine patients. It comprises (anteriorly in supine patients) abolished lung sliding and the A-line sign (no B-line should be observed). Abolished lung sliding can be identified in M-mode (right image) by the stratospheric pattern, the “stratosphere sign”. Note the intelligent technology: both images are strictly aligned. The pleural line, which is impossible to detect by looking only at the right image, is clearly located using the left image (arrow). Note that there is no “barcode sign” at CEURF for several reasons, one of them being due to the recent introduction barcodes, which may add more confusion to the field. Daniel Lichtenstein Breathe 2017;13:100-111 ©2017 by European Respiratory Society