...you would get
this:
...backflow
of blood into the IV tubing.
Again, why does this happen? Well, Judy Amygdala
has the answer:
"It's largely about blood pressure. You get
back-flow in an IV line when the blood pressure
inside that vein is greater than the pressure in the
IV line." https://punchingjudy.wordpress.com/tag/iv/
This also has a pretty quick fix. If you notice
blood backing into the IV line, just raise the IV
bag or lower the IV site.
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