Evaluating the Osmole Gap for Toxic Alcohol Poisoning Screening
Author Information
Author(s): Lynd Larry D, Richardson Kathryn J, Purssell Roy A, Abu-Laban Riyad B, Brubacher Jeffery R, Lepik Katherine J, Sivilotti Marco L A
Primary Institution: University of British Columbia
Hypothesis
Can the osmole gap accurately screen for ethylene glycol and methanol exposure?
Conclusion
The osmole gap can provide additional diagnostic information for identifying patients needing hemodialysis or antidotal therapy for toxic alcohol poisoning.
Supporting Evidence
- The osmole gap provides at least some discriminatory diagnostic information.
- An osmole gap threshold of 10 has a sensitivity of 1 for identifying patients needing hemodialysis.
- Using an ethanol coefficient of 1.25 improves specificity without compromising sensitivity.
Takeaway
Doctors can use a test called the osmole gap to help find out if someone has drunk harmful alcohols, like antifreeze, but it's not perfect.
Methodology
Retrospective analysis of laboratory records from two hospitals, measuring various serum concentrations.
Potential Biases
Potential referral or ascertainment bias due to only including patients with measured toxic alcohol levels.
Limitations
The study is limited by its retrospective design and the requirement for simultaneous laboratory measurements.
Participant Demographics
Patients from two tertiary-care hospitals, with a focus on those suspected of toxic alcohol exposure.
Statistical Information
P-Value
p<0.001
Confidence Interval
95% CI, 0.68 – 0.99
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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