Re: transcranial Doppler with microbubbles????
The microbubbles can demonstrate any right-to-left shunt.
The article link below is from ACR (American College of Radiology)'s guidelines:
http://www.acr.org/SecondaryMainMenu...l_doppler.aspx
It briefly touches on the reason for using the microbubbles.
While I've never seen this procedure, I have participated in many contrast echocardiograms, for which we inject agitated saline IV.
The purpose of these studies is to demonstrate (or not

) any unusual/abnormal communication between the ventricles or atria (PFO = patent foramen ovale).
You might do a google or yahoo or vivisimo search and ferret out any more information on the microbubbles as their use pertains to the transcranial ultrasound.
Good luck!
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