injuries poisoning
How To Do an Infraorbital Nerve Block, Percutaneous
Step by Step Description of Procedure
Check sensation in the infraorbital nerve distribution. Wear gloves and use appropriate barrier precautions. Palpate the infraorbital ridge and identify the infraorbital foramen (the injection site). Cleanse the skin site with antiseptic solution. Place a skin wheal of anesthetic, if one is being used, at the needle-entry site. Insert the needle just below the infraorbital foramen pointing slightly cephalad and advance it until paresthesia is elicited or the needle meets the maxillary bone just superior to the foramen.Do not insert the needle into the infraorbital foramen. If paresthesia occurs during insertion,withdraw the needle 1 to 2 mm. Aspirate to exclude intravascular placement and then slowly (ie, over 30 to 60 seconds) inject about 2 to 3 mL of anesthetic adjacent to, but not into, the infraorbital foramen. Press your finger lightly over the infraorbital rim to prevent lower eyelid swelling. Massage the area for about 10 seconds to hasten the onset of anesthesia. Allow about 5 to 10 minutes for the anesthetic to take effect. 