What are the symptoms of cyanide toxicity after exposure to high vapor concentrations?

Updated: May 30, 2020
  • Author: Inna Leybell, MD; Chief Editor: Michael A Miller, MD  more...
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Symptoms after exposure to high vapor concentrations may include the following:

  • Transient hyperpnea and hypertension 15 seconds after inhalation

  • Convulsions in 30-45 seconds

  • Loss of consciousness in 30 seconds

  • Respiratory arrest in 3-5 minutes

  • Bradycardia, hypotension, and cardiac arrest within 5-8 minutes of exposure

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