emDOCs.net Emergency Medicine (EM) Podcast · emDOCs.net EM Crew

Episode 134: Acute Acetaminophen Toxicity

·21 min·1 clip

The RUMAC-Matthew nomogram only applies to acute single ingestions, and co-ingestions can cause "line jumping."

Rachel Bridwell returns to the emdocs.net podcast with Britt Long and Manny Singh to talk through acetaminophen toxicity. The discussion opens with a 17-year-old who presents after a toxic ingestion following a suicide attempt. That case becomes the anchor for sorting out timing, amount, and formulation, the details that decide how worried the team needs to be. The hosts keep the focus on the emergency department and treat acetaminophen as a common toxicology problem with uncommon stakes. They walk through the four stages of toxicity. Early symptoms can be vague. As injury progresses, AST and ALT can rise sharply, and the episode notes that acetaminophen is one of the few causes that can push those values above 10,000 IU/L. Stage 3 brings coagulopathy. Acute renal failure can also appear. The show notes that a screening ECG may show tachycardia, ST changes, or T-wave inversions from systemic ischemic stress rather than direct cardiotoxicity. A major section covers when to obtain the acetaminophen level. The level is ideally drawn four hours after ingestion. The Rumack-Matthew nomogram is used for acute single ingestions. It does not apply when the time of ingestion is unknown or when the exposure is chronic. The treatment line at four hours is 150 micrograms per milliliter. NAC is presented as the treatment of choice. The hosts also discuss how combination products with opiates or anticholinergics can muddy the presentation. When the ingestion is massive, toxicology becomes central to the next steps. Some patients will need ICU care or transfer to a liver transplant center, with King's College criteria in view. The episode closes by returning to high-dose NAC, fomepizole, and dialysis as escalation options.

As heard by us

A tight toxicology refresher that turns a common overdose into concrete ED decisions.

Acetaminophen toxicity is treated as a straightforward ED tox problem here, with the focus kept on a real ingestion and the decisions it forces.

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Why you'd press play

You need the playbook for a bread-and-butter toxicology case before the labs turn ugly.

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