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As we are now into the winter months, exposures to ethylene glycol (antifreeze) and methanol (windshield washer fluid) increase. Here is a good mnemonic for sorting through an anion gap metabolic acidosis:
C – cyanide, carbon monoxide
A – alcoholic ketoacidosis, acetaminophen (massive OD)
T – toluene (chronic from glue sniffing)
M – methanol, metformin
U – uremia
D – diabetic ketoacidosis
P – propofol infusion syndrome, propylene glycol, paraldehyde
I – iron, isoniazid, ibuprofen (massive OD)
L – lactic acidosis
E – ethylene glycol
S – salicylates, starvation ketoacidosis