A patient receives intravenous lidocaine for a painful procedure. Which finding suggests an early central nervous system effect of local anaesthetic toxicity?

Correct answer: A. Perioral numbness and a metallic taste

  • A. Perioral numbness and a metallic taste
  • B. Severe ankle swelling and weight gain
  • C. Yellow skin and pale stools
  • D. Increased urine output and intense thirst

Explanation

Early local anaesthetic toxicity may cause circumoral numbness, metallic taste, tinnitus, dizziness, or agitation before seizures and cardiovascular collapse. The other findings suggest problems unrelated to local anaesthetic toxicity.

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About Analgesics and CNS Drugs

This area covers opioid and non-opioid analgesics, local anaesthetics, sedatives, anxiolytics, antidepressants, antipsychotics, antiepileptics and drugs for Parkinsonism. It examines therapeutic actions, dependence, respiratory depression, extrapyramidal effects, serotonin related toxicity and the distinction between pain relief, sedation and loss of consciousness.

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