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Osmolal gap in alcoholic ketoacidosis
1Division of Nephrology, University of British Columbia, Vancouver Hospital, Canada.
Clinical Nephrology
|July 1, 1997
Summary
Severe metabolic acidosis in alcoholics can mimic toxic alcohol poisoning. This study highlights that high osmolal and anion gaps can result from alcoholic ketoacidosis, not just toxic alcohol ingestion.
Area of Science:
- Internal Medicine
- Toxicology
- Emergency Medicine
Background:
- Metabolic acidosis in alcoholic patients presents diagnostic challenges, often mimicking toxic alcohol ingestion.
- Distinguishing alcoholic ketoacidosis from toxic alcohol poisoning is difficult on initial presentation.
- High osmolal gap with increased anion gap acidosis is a marker for toxic alcohol poisoning but lacks specificity.
Observation:
- Two cases of severe metabolic acidosis with very high osmolal and anion gaps were observed.
- These cases were attributed to alcoholic ketoacidosis.
- No evidence of toxic alcohol ingestion was found in either case.
Findings:
- Alcoholic ketoacidosis can present with a very high osmolal gap and anion gap metabolic acidosis.
- This presentation can be indistinguishable from toxic alcohol poisoning based solely on initial laboratory values.
- Empirical treatment for toxic alcohol poisoning may be initiated unnecessarily.
Implications:
- Clinicians should consider alcoholic ketoacidosis in the differential diagnosis of high anion gap metabolic acidosis with a high osmolal gap in alcoholic patients.
- Avoid premature invasive interventions for toxic alcohol poisoning before confirming the diagnosis.
- Further investigation is needed to refine diagnostic criteria for differentiating these conditions.