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Methanol poisoning: predictors of visual outcomes
Tejas Desai1, Aditya Sudhalkar, Usha Vyas
1Department of Ophthalmology, Nagri Eye Hospital, India.
JAMA Ophthalmology
|January 11, 2013
Summary
Laboratory markers, particularly arterial pH, predict visual outcomes in methanol poisoning patients. Acidosis severity at presentation is key, with early treatment showing limited impact on permanent visual loss.
Area of Science:
- Toxicology
- Ophthalmology
- Emergency Medicine
Background:
- Methanol ingestion can cause severe visual impairment and toxicity.
- Predicting visual outcomes in methanol poisoning is crucial for patient management.
- Laboratory markers may offer insights into prognosis.
Purpose of the Study:
- To evaluate laboratory markers of methanol ingestion and toxicity as predictors of visual outcomes.
- To correlate biochemical findings with visual acuity (VA) and visual disturbance severity.
Main Methods:
- Retrospective review of 122 methanol poisoning cases.
- Analysis of patient history, ocular/systemic exams, and laboratory results (including arterial pH, methanol levels).
- Classification of visual disturbance as transient or permanent; assessment of VA at presentation and 3 months post-discharge.
Main Results:
- Arterial pH was the strongest predictor of final VA and improvement.
- Patients with initial pH > 7.2 had significantly higher odds of transient visual disturbances (OR 31).
- Only one patient experienced a significant drop in VA; 10 patients died.
Conclusions:
- The degree of acidosis at presentation is a primary determinant of final visual acuity.
- Early presentation and treatment did not significantly alter visual outcomes in severe methanol poisoning cases.
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