1. Using your dominant hand, grasp the cannula or the cannula's wings (if butterfly). If
using an over-the-needle administered a local you previously anesthetic, its
effectiveness will extend for only to inch (0.6 to 1.9 cm) from the injection site. Touch the spot with the cannula tip and ask the patient if it feels sharp. If she says no you know the site is properly anesthetized. Proceed at once with venipuncture. Note: If you didn't use a encourage the palocal anesthetic, tient to relax. Tell her to breathe slowly in and out as you insert the cannula.