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Toxic alcohol ingestion involves the consumption of methanol, ethylene glycol, or isopropanol, which can cause severe metabolic acidosis, organ damage, and death. These substances are commonly found in antifreeze, windshield washer fluid, and industrial solvents, often consumed accidentally or intentionally as ethanol substitutes. Early recognition and treatment with fomepizole or ethanol, along with hemodialysis, are critical for preventing permanent disability or death.
Toxic alcohols are metabolized by alcohol dehydrogenase into highly toxic metabolites: methanol produces formaldehyde and formic acid causing optic nerve damage and metabolic acidosis, while ethylene glycol forms glycolic and oxalic acids leading to renal failure and calcium oxalate crystal deposition. Isopropanol metabolizes to acetone, causing CNS depression and ketosis without significant acidosis. The accumulation of these toxic metabolites overwhelms cellular metabolism and causes end-organ damage through direct cytotoxicity and severe acid-base disturbances.
Clinical presentation varies by substance and timing, with an initial period resembling ethanol intoxication followed by a latent phase before severe toxicity develops as metabolites accumulate. Methanol poisoning presents with visual disturbances and blindness, ethylene glycol causes renal failure and neurologic symptoms, while isopropanol primarily causes profound CNS depression. Laboratory findings include elevated anion gap metabolic acidosis (except isopropanol), elevated osmolal gap, and specific metabolites on toxicology screening, requiring immediate antidotal therapy to prevent irreversible organ damage.