NBDE Quiz # 33
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NBDE Quiz # 33
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1. Question
After giving two cartridges of 2% lidocaine to anesthetize the inferior alveolar nerve, the patient develops facial drooping on the side of the injection. This complication occurred because the needle was directed:
CorrectThe correct answer is C. Having the needle directed to high (superior) can cause anesthetic to move through the sigmoid notch into the parotid gland, anesthetizing the facial nerve. An injection to inferior would cause lingual nerve anesthesia but will miss the main branch of the IAN. Too far lateral will place the needle into the buccinator. Too deep a needle placement may cause complications such as hematoma but will not likely cause CNVII nerve dysfunction.
IncorrectThe correct answer is C. Having the needle directed to high (superior) can cause anesthetic to move through the sigmoid notch into the parotid gland, anesthetizing the facial nerve. An injection to inferior would cause lingual nerve anesthesia but will miss the main branch of the IAN. Too far lateral will place the needle into the buccinator. Too deep a needle placement may cause complications such as hematoma but will not likely cause CNVII nerve dysfunction.