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Ever forget all the things that make up MUDPILES in your AG acidosis differential?
Instead, consider the less-complicated mnemonic "KILR"!
K Ketoacidosis (diabetic, alcoholic, starvation)
I Ingestion (salicylate, acetaminophen, methanol, ethylene glycol, CO, CN, iron, INH)
L Lactic acidosis (infection, hemorrhage, hypoperfusion, alcohol, metformin)
R Renal (uremia)
Once you rule out the KLR causes, begin to consider ingestion or a tox source as your source. Remember that many of the listed ingestions can also cause a lactic acidosis.
References
For more acid/base pearls in greater detail:
http://lifeinthefastlane.com/ccc/anion-gap/
http://emcrit.org/wp-content/uploads/acid_base_sheet_2-2011.pdf (from emcrit.org)