Dear John,
Feel free to call me regarding carotid duplex studies on kids.  First, use the smallest footprint of a transducer technically possible 10-12 MHz is best.  Your standard PSV velocity criteria used for adults does not apply.  If the child has sleep apnea, they may have a tortuous carotid anatomy.  
What are the symptoms and what are you being asked to look for?  
Connie McCoy, RVT
Cincinnati Children's Hospital
513-636-1001

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