A 40-year-old man is brought to ED after a deliberate methanol ingestion. ABG: pH 7.18, PaCO₂ 22 mmHg, PaO₂ 98 mmHg, HCO₃⁻ 8 mmol/L. Na⁺ 142, K⁺ 4.2,

Question

A 40-year-old man is brought to ED after a deliberate methanol ingestion. ABG: pH 7.18, PaCO₂ 22 mmHg, PaO₂ 98 mmHg, HCO₃⁻ 8 mmol/L. Na⁺ 142, K⁺ 4.2, Cl⁻ 102 mmol/L. Osmolar gap is 25. What is the acid-base disturbance?

Accepted Answer

Metabolic acidosis with respiratory compensation

Answer

Acute respiratory acidosis

Answer

Chronic respiratory acidosis with acute decompensation

Answer

Chronic respiratory alkalosis

Answer

Mixed respiratory and metabolic acidosis

Methanol Poisoning — RACP Adult Medicine MCQ

A 40-year-old man is brought to ED after a deliberate methanol ingestion. ABG: pH 7.18, PaCO₂ 22 mmHg, PaO₂ 98 mmHg, HCO₃⁻ 8 mmol/L. Na⁺ 142, K⁺ 4.2, Cl⁻ 102 mmol/L. Osmolar gap is 25. What is the acid-base disturbance?