Valves are one of the leading causes of blown veins and failed IV starts. Here’s how to test a vein for valves.
Valves make it damn near impossible to thread an IV thru. You can use floating techniques but it’s probably best to avoid the issue if you can. Look for where veins join together (good probability of a valve there), and “knots” on the vein that you can see and feel.
You can also run your finger up the vein, pushing the blood out on the way back towards the patient while holding down pressure on a distal piece of the vein so it can’t refill with blood. Where the blood flows back to and stops, you know there lies a valve.
But if you get good at floating in IVs, valves aren’t so scary 😉
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