{"type":"rich","version":"1.0","provider_name":"Transistor","provider_url":"https://transistor.fm","author_name":"Board Pearls","title":"Chapter 19, Ep 1 of 2: Drug-Induced Liver Injury and Acetaminophen","html":"","width":"100%","height":180,"duration":1316,"description":"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.\n \nTopics covered\n\nDrug injury as the diagnosis for any new abnormal liver tests\nIntrinsic versus idiosyncratic versus indirect hepatotoxicity\nEpidemiology and environmental plus genetic risk factors\nHerbal and dietary supplement injury\nMetabolic activation and the phase-one, phase-two two-step\nAgent-specific patterns from isoniazid to amiodarone\nHy's Law, R value, and causality assessment\nHistology patterns mapped to drug classes\nAcetaminophen toxicity, the nomogram, and N-acetylcysteine\n \n \nKey decisions\n\nHy's Law is met when transaminases exceed three times normal, total bilirubin exceeds two times normal, alkaline phosphatase is under two times normal, and no other cause explains it, at which point mortality is about ten percent and the drug is stopped with transplant-center awareness.\nThe R value classifies pattern, hepatocellular over five, cholestatic under two, mixed between, with hepatocellular injury more likely to evolve to acute failure and cholestatic or mixed more likely to become chronic.\nAcetaminophen toxicity occurs when NAPQI production exceeds glutathione capacity, so a chronic alcohol user with CYP2E1 induction and glutathione depletion can develop fulminant injury on therapeutic-range dosing without ever taking an overdose.\nAn acute single ingestion of seven...","thumbnail_url":"https://img.transistorcdn.com/-FuAdDBcPDLhEoUmroZKtOBRvuBn_FHPpYlh41hOnU4/rs:fill:0:0:1/w:400/h:400/q:60/mb:500000/aHR0cHM6Ly9pbWct/dXBsb2FkLXByb2R1/Y3Rpb24udHJhbnNp/c3Rvci5mbS9iNzlh/ZTU4Y2MzNWExMjQ5/MjA5OWMwMmI3ZTk5/NGFiZS5wbmc.webp","thumbnail_width":300,"thumbnail_height":300}