What is the role of ethylene glycol in the pathogenesis of metabolic acidosis?

Updated: Oct 10, 2018
  • Author: Christie P Thomas, MBBS, FRCP, FASN, FAHA; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Ingestion of ethylene glycol, a component of antifreeze and engine coolants, leads to a high-AG acidosis. Ethylene glycol is converted by alcohol dehydrogenase first to glycoaldehyde and then to glycolic and glyoxylic acids. Glyoxylic acid then is degraded to several compounds, including oxalic acid, which is toxic, and glycine, which is relatively innocuous.

The high AG is primarily from the accumulation of these acids, although a mild lactic acidosis also may be present.

Patients present with CNS symptoms, including slurred speech, confusion, stupor or coma, myocardial depression, and renal failure with flank pain.

Oxalate crystals are usually observed in the urine and are an important clue to the diagnosis, as is an elevated osmolar gap.


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