Drug-Induced Liver Injury and Acute Liver Failure

• Audio chapter
  Single-voice audio, listen on the commute.
• ABIM-format MCQs
  5-option vignettes with full wrong-answer teaching.
• Study guide
  Tables, decision trees, primary sources.
• AI tutor
  Chapter-grounded, answers the question you're stuck on.

What this chapter covers

• Section 19.1: DILI epidemiology and risk factors

  Drug-induced liver injury is the diagnosis to reach for when a patient with new abnormal liver tests is taking almost anything, and the unifying claim is that essentially any drug, herbal product, or dietary supplement can produce essentially any pattern of injury.

• Section 19.2: CYP interactions and metabolic activation

  DILI mechanism is fundamentally a story about reactive metabolite generation, and understanding why a particular drug becomes hepatotoxic in a particular host matters more than memorizing offender lists.

• Section 19.3: Hy's Law and severity

  Hy's Law is the single rule to apply at the bedside, and its power is that it identifies an early biochemical signature of serious DILI before fulminant failure becomes obvious.

• Section 19.4: Histology patterns by drug class

  DILI histology is patterned, and a candidate who knows the dominant pattern can often guess the drug class from the biopsy stem.

• Section 19.5: Acetaminophen toxicity and NAC

  Acetaminophen toxicity is the prototypical intrinsic DILI, the leading cause of acute liver failure in the United States and the United Kingdom, and the entity whose mechanism, dose-mortality relationship, nomogram, and antidote algorithm must be known cold.

• Section 19.6: ALF definition, etiologies, and ALFSG distribution

  Acute liver failure is the small but lethal entity defined by the rapid loss of hepatic synthetic and detoxifying function in a previously healthy liver, and applying the definition cleanly matters because the management hinges on it.

• Section 19.7: Wilsonian and HSV ALF

  The two cause-specific ALF entities to know are Wilsonian ALF and HSV ALF, because both have specific empiric therapies that should be started before confirmation, and both have recognition fingerprints to know cold.

• Section 19.8: King's College Criteria and ALF triage

  The King's College Criteria are the prognostic scoring tools developed at King's College Hospital in London that identify ALF patients who are unlikely to recover without transplantation, and they are applied at the bedside.

Podcast episodes

1. 01

   Induced Liver Injury and Acetaminophen

   Episode one of the Drug-Induced Liver Injury and Acute Liver Failure chapter builds drug injury from a single mechanism: cytochrome oxidation makes a reactive intermediate, phase-two conjugation quenches it or fails, and injury appears where phase one outpaces phase two. That frame makes the offender lists predictable, the histology readable, and the severity rules non-arbitrary. Hy's Law converts biochemistry into a triage decision, R value predicts trajectory, and histology patterns map backward to drug classes. Acetaminophen is the prototype that runs the whole sequence at speed, with the Rumack-Matthew nomogram, N-acetylcysteine, and time-to-treatment mortality all board-tested cold.

   Read the transcript →
2. 02

   Acute Liver Failure and the King's College Criteria

   Episode two shifts from the drug to the failing organ, asking whether the liver can still recover on its own, how much time you have to decide, and when a different liver is the only answer. It anchors on the four-criterion definition of acute liver failure, then shows how etiology maps directly to the probability of spontaneous recovery. Two special causes, Wilsonian and herpes acute liver failure, each carry a distinctive fingerprint that demands empiric therapy before the workup completes. The King's College Criteria then triage who gets listed, with separate acetaminophen and non-acetaminophen paths calibrated to that recovery probability.

   Read the transcript →

Key topics

• ·Drug injury as the diagnosis for any new abnormal liver tests
• ·Intrinsic versus idiosyncratic versus indirect hepatotoxicity
• ·Epidemiology and environmental plus genetic risk factors
• ·Herbal and dietary supplement injury
• ·Metabolic activation and the phase-one, phase-two two-step
• ·Agent-specific patterns from isoniazid to amiodarone
• ·Hy's Law, R value, and causality assessment
• ·Histology patterns mapped to drug classes
• ·Acetaminophen toxicity, the nomogram, and N-acetylcysteine
• ·The four-criterion definition of acute liver failure
• ·Distinction from acute-on-chronic failure and cerebral edema
• ·Encephalopathy grading one through four
• ·Etiology distribution and its link to prognosis
• ·Non-cerebral and cerebral edema management
• ·Wilsonian acute liver failure and its fingerprint
• ·Herpes acute liver failure and empiric acyclovir
• ·N-acetylcysteine in non-acetaminophen failure
• ·King's College Criteria and transplant listing