Figure 5.

Ultrasound M-mode and B-mode. T- and O-lines, seashore and stratosphere signs (discussed later). A) Physiologic T-lines (white arrowheads) during apnoea on M-mode. There is interspersing seashore and barcode sign. B) Physiologic T-lines (white arrowheads) during apnoea (left, stratosphere sign), not present during breathing (right, seashore sign) presented in M-mode. C) Nearly black ultrasound lung. Note presence of faint A’-lines (white arrows), but not A-line (white arrowhead in expected place)