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Video 18-9: This video shows a pleural effusion with respirophasic and cardiophasic movement of echogenic elements within the effusion.

From: Critical Care Ultrasonography, Second Edition

This is termed the plankton sign. The 3.5 MHz transducer is in longitudinal orientation and placed perpendicular to the chest wall to scan through the 7th intercostal space in the right mid-axillary line.

11 secs
Author(s) Lewis Eisen, Peter Doelken, Sahar Ahmad
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