Elevated anion gap metabolic acidosis with normal lactate; list common etiologies (MUDPILES). Which of the following is a known cause?

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Multiple Choice

Elevated anion gap metabolic acidosis with normal lactate; list common etiologies (MUDPILES). Which of the following is a known cause?

Elevated anion gap metabolic acidosis means there are extra unmeasured anions (organic acids) accumulating in the blood. When lactate is normal, you’re looking beyond lactic acidosis to other sources of acids. The MUDPILES framework helps recall common culprits, including toxic alcohols like methanol and ethylene glycol, which generate strong acids that raise the anion gap. Methanol is a classic cause because it is metabolized by alcohol dehydrogenase first to formaldehyde and then to formic acid, which accumulates and drives the high anion gap. This pattern fits the scenario of an elevated anion gap with a normal lactate. In addition, toxic alcohol ingestions often come with an osmolar gap, and patients may have vision changes due to formic acid toxicity. Hyperlipidemia and hypovolemia do not typically produce this pattern of anion gap acidosis with a normal lactate. Ethanol can be involved in alcoholic ketoacidosis in some settings, but methanol remains the prototypical toxin associated with this exact metabolic profile.

Elevated anion gap metabolic acidosis means there are extra unmeasured anions (organic acids) accumulating in the blood. When lactate is normal, you’re looking beyond lactic acidosis to other sources of acids. The MUDPILES framework helps recall common culprits, including toxic alcohols like methanol and ethylene glycol, which generate strong acids that raise the anion gap.

Methanol is a classic cause because it is metabolized by alcohol dehydrogenase first to formaldehyde and then to formic acid, which accumulates and drives the high anion gap. This pattern fits the scenario of an elevated anion gap with a normal lactate. In addition, toxic alcohol ingestions often come with an osmolar gap, and patients may have vision changes due to formic acid toxicity.

Hyperlipidemia and hypovolemia do not typically produce this pattern of anion gap acidosis with a normal lactate. Ethanol can be involved in alcoholic ketoacidosis in some settings, but methanol remains the prototypical toxin associated with this exact metabolic profile.

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