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Hy's law

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Hy's law

Hy's law is a rule of thumb that a patient is at high risk of a fatal drug-induced liver injury if given a medication that causes hepatocellular injury (not Hepatobiliary injury) with jaundice. The law is based on observations by Hy Zimmerman, a major scholar of drug-induced liver injury. Some have suggested the principle be called a hypothesis or observation.

Hy's Law cases have three components:

In Zimmerman's analysis of 116 patients with hepatocellular injury and jaundice due to drug exposure, 76% went on to either require a liver transplant or died. Other studies have reported a lower but still significant mortality of 10%.

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