venous air embolism

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just a guess, but is it a combo of gas rising + a lack of venous valves in relevant veins?
 
Thanks to the keyword gravity I found this in google books.

With the operative site elevated compared with the heart, gravity causes a negative venous gradient between the operative site and the right atrium; this creates a potential for an air embolism if a venous sinus is opened.

From
Alexander's Care of the Patient in Surgery

Thanks, question solved.


 
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