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Do you DEWshine ?

 

This article is from the Tennessee Poison Center

posted on January 26, 2016

by Donna Seger, MD Medical Toxicologist
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 This past week, the Tennessee poison center was involved in the care of 4 teenagers from Robertson County who drank Mountain Dew mixed with racing fuel (aka Dewshine). Racing fuel (used for drag racing) is almost 100% methanol. Two of these teenagers died.

  Mountain Dew and Sun Drop are favorite beverages used to mix with corn liquor (better known to most as Moonshine) in the Appalachians. However, if mixed with racing fuel, which can be purchased legally for $8 a gallon, the methanol can be life threatening. 

  Methanol has relatively low toxicity but it is metabolized to formaldehyde which is subsequently oxidized to formic acid. The conversion from formaldehyde to formic acid is very rapid and occurs within minutes. Formic acid is converted by 10-formyl tetrahydrofolate synthetase to carbon dioxide and water. Formic acid accumulates. Not surprisingly, there is a direct correlation between formic acid concentration and morbidity and mortality. Formic acid inhibits cytochrome oxidase, the inhibition increases as the pH decreases, and cellular injury occurs. Lactate is produced as formic acid interferes with intracellular respiration and promotes anaerobic metabolism. The combination of the formic acid and lactic acid can cause a life-threatening acidosis.
  Ocular toxicity is caused by formic acid directly. MRI reveals edema and necrotic damage in the basal ganglia and putamen and hemorrhage in the white matter. Cause is thought to be due to failure of Na-K ATPase pump as the formic acid inhibits cytochrome oxidase.
  Signs and symptoms include nausea and vomiting and CNS depression (depending on methanol dose). A latent period lasting 12-124 hours and blurred vision may occur.
  Blood analysis reveals an osmolar gap (depending on the amount of methanol that has not been metabolized); an acidosis (depending on the amount of methanol that has been metabolized); and an anion gap.
  Treatment is correction of the acidosis with sodium bicarbonate and administration of fomepizole which is a potent inhibitor of alcohol dehydrogenase. Prior to fomepizole, ethanol was administered but there were multiple problems with that administration. (Drunk people in the PICU/ICU can be difficult to manage). Depending on the methanol concentration and the clinical picture, hemodialysis may be necessary.

It’s important to mention that Mountain Dew has a completely unrelated non-alcoholic called MtnDEW  DEWshine. Which is a version of Mountain Dew made with real sugar, but marketed like an underground, backwoods product, much like alcoholic moonshine. If you hear kids talking about “dewshine,” it’s best to find out which version they’re talking about before jumping to any conclusions.

 

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