Precordial or transesophageal Doppler ultrasonography can be used to evaluate the extent of venous air emboli lodged centrally. A venous air embolism will eventually lodge in the right atrium, right ventricle or right ventricular outflow tract.
Finding on Doppler Ultrasonography
Stage
no air bubbles
0
single air bubble
I
less than half of the anatomic site filled with air bubbles
II
more than half of anatomic site but not all filled with air bubbles
III
entire anatomic site filled with air bubbles
IV
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