2. Approaching the vein from the side. Position the cannula tip adjacent to the vein, aimed toward it. This method, which is preferred if you've injected a local anesthetic, reduces the risk of piercing the vein's back wall.
2. Approaching the vein from the side. Position the cannula tip adjacent to the vein, aimed toward it. This method, which is preferred if you've injected a local anesthetic, reduces the risk of piercing the vein's back wall.