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Methanol and formate kinetics in late diagnosed methanol intoxication
D Jacobsen1, R Webb, T D Collins
1Department of Pharmacology, Louisiana State University Medical Center, Shreveport.
Medical Toxicology and Adverse Drug Experience
|September 1, 1988
Summary
This case study highlights delayed methanol intoxication diagnosis. Aggressive acidosis treatment may enhance formate elimination, a toxic metabolite.
Area of Science:
- Toxicology
- Metabolic Medicine
Background:
- Methanol intoxication requires timely diagnosis and treatment to prevent severe toxicity.
- Formate accumulation is a key driver of metabolic acidosis and end-organ damage in methanol poisoning.
Observation:
- A 21-year-old patient presented with methanol intoxication, undiagnosed for 12 hours.
- Initial treatment included bicarbonate, followed by ethanol and haemodialysis.
- Peak methanol and formate levels were 143 mg/dl and 54.3 mg/dl, respectively.
Findings:
- Delayed diagnosis allowed for unique estimation of methanol elimination kinetics.
- Methanol elimination followed zero-order kinetics (8.5 mg/dl/h) before specific treatment.
- Formate levels decreased after pH normalization with bicarbonate, suggesting pH-dependent formate elimination.
Implications:
- Aggressive treatment of metabolic acidosis may accelerate the elimination of toxic formate.
- Understanding methanol elimination kinetics and formate clearance is crucial for effective patient management.
- This case underscores the importance of early recognition and comprehensive treatment strategies in methanol poisoning.