The symptoms described (metallic taste, tinnitus, and perioral numbness) are classic early signs of Local Anesthetic Systemic Toxicity (LAST), indicating systemic absorption of the local anesthetic. The immediate and specific treatment for LAST, especially with neurological symptoms, is the administration of intravenous lipid emulsion (ILE) 20% bolus. ILE acts as a 'lipid sink,' sequestering the local anesthetic from target organs. While increasing oxygen and monitoring vital signs (options C and D) are important supportive measures, and midazolam (option B) would be used for seizures (a later manifestation of LAST), the most appropriate and specific immediate intervention for these early signs of LAST is ILE.
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