Episode 13 Part 2: Killer Coma Cases – The Intoxicated Patient

In part 2 of this episode Killer Coma Cases – The Intoxicated Patient, Dr. Helman presents two more cases to Dr. Carr and Dr. Steinhart, who give us their insights into the common conundrums when it comes to the intoxicated ED patient, and some key clues to the not-so-common life threatening toxicological emergencies that we need to be on the look out for.

In part 2 of this Killer Coma Cases episode we review the differential diagnosis of altered mental status and hypothermia, discuss the the utility of the ‘coma cocktail’, debate the use of naloxone and much more….

Written Summary and blog post by Lucas Chartier, edited by Anton Helman April 2011

Please listen to Episode 13 Part 1 before this episode

Methanol Poisoning

  • When to suspect toxic alcohol ingestion in the face of an intoxicated patient
    • Kussmaul breathing (i.e. metabolic acidosis), abdominal pain or ocular complaints, if the patient appears drunk with low blood levels of ethanol, or isn’t clinically improving
  • Causes of increased osmolar gap in a patient with coma:
    • “ME DIE”: Methanol, Ethylene Glycol, Diuretics (osmotic ones like mannitol), Isopropyl Alcohol (‘rubbing alcohol’), Ethanol; also consider propylene glycol, glycerol and ketones
  • Methanol (in windshield washer, solvents and fuels) kills retinal and optic nerve cells, leading to classic ‘snowstorm’ vision, flashes, and eventually blindness if not treated; lethal dose is 1g/kg (as little as 30cc of methanol or 100c of windshield washer fluid)

Osmolar (usually between ‐2 and +6) and anion (usually <12) gaps:

  • As toxic alcohols are ingested, the compounds are only osmolally active at first (i.e. high osmolar gap, no anion gap), until they are degraded in their metabolites which create the anion‐gap acidosis (i.e. both osmolar and anion gap); late in the course, when all the parent compounds have been degraded, there is only an anion gap with no osmolar gap; therefore early presenters may have normal AG and late presenters may have normal Osmolar Gap
  • Treatment should be started empirically before toxicologic confirmation occurs with fomepizole (expensive) or ethanol (IV or oral), bicarb for pH30cc of methanol ingestion (get your nephrologist involved early!)

Serotonin syndrome (SS)

  • Often rapid onset (vs. more prolonged in NMS) as a result of overdose or, most commonly, combination of prescription (eg, SSRI, MAOIs) and non‐prescription drugs (recreational such as ‘ecstasy’/methamphetamine, or OTC)
    • Mnemonic “SHIVERS:
      • Shivering
      • Hyper‐reflexia (myoclonus vs. “lead‐pipe”rigidity in NMS)
      • Increased temperature
      • Vital signs instability (high BP, HR, RR)
      • Encephalopathy (or any altered LOC)
      • Restlessness
      • Sweating
    • Clonus in the setting of ‘Ecstasy’/methamphetamine use should prompt the diagnosis of SS!
    • ‘Ecstasy’ is now the most common trigger of SS in Ontario, Canada
    • Also beware of dilutional hyponatremia in people participating in ‘Rave Parties’, where they drink LOTS of water
  • Drugs associated with SS: anti‐depressants – SSRIs, SNRIs, MAOIs, TCAs; pain medications – Demerol, fentanyl, tramadol; headache medications – maxeran, triptans; weight loss drugs; drugs of abuse – amphetamines; as well as dextromethorphan (in Tylenol Cold©), linezolid, ondansetron and granisetron
  • Treatment: mainly supportive with activated charcoal as necessary, external and/or internal cooling, benzodiazepines, and consider olanzapine, chlorpromazine (DO NOT use if NMS is considered), and the antidote cyproheptadine in conjunction with a toxicology consultation (do not give both charcoal and cyproheptadine as it is an oral medication!)


For more on comatose patients in the emergency department on EM Cases:

Episode 13 Part 1: Killer Coma Cases – The Found Down Patient
Best Case Ever 2 The Found Down Patient

Key References

Walls RM, Murphy MF. Manual of Emergency Airway Management. Lippincott Williams & Wilkins; 2008.

Tintinalli J, Stapczynski J, Ma OJ et al. Tintinalli’s Emergency Medicine: A Comprehensive Study Guide, Seventh Edition (Book and DVD). Mcgraw-hill; 2010.

Dr. Steinhart, Dr. Carr and Dr. Helman have no conflicts of interest to declare.

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About the Author:

Dr. Anton Helman is an Emergency Physician at North York General in Toronto. He is an Assistant Professor at the University of Toronto, Division of Emergency Medicine and the Education Innovation Lead at the Schwartz-Reisman Emergency Medicine Instititute. He is the founder, editor-in-chief and host of Emergency Medicine Cases.

2 Comments

  1. […] coma cases part 1 (the found down patient) and part 2 (the intoxicated patient) on Emergency Medicine […]

  2. ed April 24, 2017 at 5:14 pm - Reply

    Dr Anton,

    Serotonin Syndrome,

    Isn’t diarrhea a clue in ddx of it from NMS too, I assume there isnt any diarrea in NMS. I am not sure if diarrhea is always though seen with SS.

    thanks
    Ed

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