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Toxicology And Toxidromes

Homepage: EMNote.org ■ 🚩Membership: https://tinyurl.com/joinemnote 🚩ACLS Lecture: https://tinyurl.com/emnoteacls Toxicology in Emergency Medicine Toxidromes Toxidromes are clinical syndromes resulting from exposure to specific toxin classes Help identify the type of poisoning based on symptoms Common toxidromes include anticholinergic, cholinergic, opioid, sympathomimetic, and sedative-hypnotic Anticholinergic Toxidrome Characterized by dry skin, dilated pupils, urinary retention, and altered mental status Caused by agents like antihistamines, tricyclic antidepressants, and certain plants Primary treatment is supportive care and administration of physostigmine Cholinergic Toxidrome Arises from exposure to organophosphates or carbamates Symptoms include salivation, lacrimation, urination, diarrhea, GI distress, and muscle twitching First-line antidote is atropine, pralidoxime can reactivate acetylcholinesterase Opioid Toxidrome Presents with respiratory depression, pinpoint pupils, and altered consciousness Immediate treatment is naloxone, an opioid antagonist Sympathomimetic Toxidrome Symptoms include tachycardia, hypertension, hyperthermia, and agitation Caused by stimulants like cocaine and amphetamines Managed with supportive care, benzodiazepines for severe cases Sedative-Hypnotic Toxidrome Characterized by CNS depression leading to drowsiness or coma Agents include benzodiazepines and barbiturates Flumazenil is an antidote for benzodiazepine overdose, but use with caution Serotonin Syndrome Results from excessive serotonergic activity, e.g. from SSRIs or MAOIs Symptoms include confusion, hyperreflexia, and autonomic instability Treated by discontinuing serotonergic agents and administering cyproheptadine Salicylate Poisoning Presents with tinnitus, metabolic acidosis, and respiratory alkalosis Treatment includes activated charcoal and sodium bicarbonate Hemodialysis may be necessary in severe cases Acetaminophen Overdose Can lead to hepatic failure if not treated promptly N-acetylcysteine (NAC) is the antidote, effective when given within 8-10 hours Early recognition using the Rumack-Matthew nomogram is crucial Carbon Monoxide Poisoning Causes headache, dizziness, confusion, and potentially death due to hypoxia Treatment involves removing from source and administering high-flow oxygen or hyperbaric oxygen Monitor for neurological sequelae