Wednesday, December 10, 2014

ductus venosus attempt in a patient who won't cooperate

What happens when we attempt duplex ultrasound imaging of the ductus venosus in a 3rd trimester pregnancy who just cant hold her breath?
These images tell the story:

During cessation of respiration (breath holding):

Observe the nice tracing/ waveform

And when the patient continues respiratory activity:
Note the interruption of the waveform. Possibly the sampling gate has shifted to another nearby vessel. 

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