Halothane Hepatotoxicity Clinical Presentation
- Author: Ruben Peralta, MD, FACS; Chief Editor: Michael R Pinsky, MD, CM, FCCP, FCCM more...
History
- Type I (mild) halothane hepatotoxicity
- Type I occurs within hours of halothane exposure.
- It does not occur after other agents.
- Type I is characterized by mild, transient elevations in serum transaminase and glutathione S- transferase concentrations.
- Jaundice is not observed, and no evidence of hepatocellular disease is present.
- Type II (fulminant) halothane hepatotoxicity
- Type II usually occurs 5-7 days following exposure, although it can be delayed by up to 4 weeks.
- Fever, leukocytosis, and eosinophilia are observed.
- Nonspecific gastrointestinal upset may be noted.
- Nausea and vomiting may occur.
- Patients may report arthralgias.
- Most prominently, the patient looks and feels unwell.
- Fulminant liver failure may ensue.
- Hepatic dysfunction in the postoperative period has many possible causes. Halothane hepatotoxicity is a diagnosis of exclusion. Other potential causes of liver dysfunction should be considered, including other hepatotoxic medications, hypotension, hypoxia, and infection.
Physical
- Physical findings in type II halothane hepatotoxicity
- Delayed pyrexia (up to 75% of patients)
- Jaundice can be present 7-10 days after exposure, but it may occur earlier in previously exposed patients.
- Liver tenderness is common but hepatomegaly is usually mild.
- A nonspecific rash may be observed.
Causes
- Type I halothane hepatotoxicity is attributed to reductive (anaerobic) halothane metabolism, with reactive metabolites causing lipid peroxidation and binding to cytochrome P-450.
- Type II halothane hepatotoxicity
- Fulminant necrosis is now believed to be an immune phenomenon occurring in genetically susceptible individuals.
- Necrosis is initiated by oxidative halothane metabolism to an intermediate.
- This intermediate subsequently binds to liver proteins, inducing trifluoroacetylation and rendering them antigenic.
- This process stimulates the formation of antibodies, which, upon reexposure to halothane (or enflurane, isoflurane, or desflurane), initiates an immune-mediated necrosis.
- The two forms are most likely unrelated, and patients who develop type I halothane hepatotoxicity are not at risk for type II.
- Animal studies have found an increase in liver damage susceptibility in interleukin 10 (IL-10) knockout mice, and other similar study have found that halothane-induced liver injury is mediated by interleukin-17 in mice.[2, 3]
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