Stop making excuses for missed IV starts! Hit the vein on the first attempt with these 7 ways to instantly improve your IV success rate. To Instantly Improve Your IV Success Rate, Improve Your Tourniquet Skill. Oftentimes, simply having a tourniquet placed on the patient is not enough to achieve the desired effect, which is to create dilation of the veins below the tourniquet. Your tourniquet needs to be tight, and release easily. Placing your tourniquet should be the first thing you do in your pre-stick routine, which will allow the veins to fill with blood as you prepare the rest of your equipment.

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