Anion gap 20 mmol/L with pH 7.18 and HCO3- 14 suggests which pattern?

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Multiple Choice

Anion gap 20 mmol/L with pH 7.18 and HCO3- 14 suggests which pattern?

This pattern is determined by recognizing acid-base disorders through pH, bicarbonate, and the anion gap. A pH of 7.18 shows acidemia, and a low HCO3– of 14 indicates a metabolic problem. The anion gap is elevated at 20 mmol/L, which points to a high anion gap metabolic acidosis rather than a normal anion gap one. In metabolic acidosis the body compensates through the respiratory system by blowing off CO2, lowering pCO2. Using Winter’s formula, the expected pCO2 is about 1.5 × HCO3– + 8, which with HCO3– = 14 gives roughly 29 mmHg (about 27–31 mmHg). If the CO2 is in that range, the pattern is metabolic acidosis with appropriate respiratory (hyperventilatory) compensation. The high anion gap helps identify the cause as a high anion gap metabolic acidosis, rather than a normal gap one, and the overall picture matches a primary metabolic acidosis with respiratory compensation.

This pattern is determined by recognizing acid-base disorders through pH, bicarbonate, and the anion gap. A pH of 7.18 shows acidemia, and a low HCO3– of 14 indicates a metabolic problem. The anion gap is elevated at 20 mmol/L, which points to a high anion gap metabolic acidosis rather than a normal anion gap one. In metabolic acidosis the body compensates through the respiratory system by blowing off CO2, lowering pCO2. Using Winter’s formula, the expected pCO2 is about 1.5 × HCO3– + 8, which with HCO3– = 14 gives roughly 29 mmHg (about 27–31 mmHg). If the CO2 is in that range, the pattern is metabolic acidosis with appropriate respiratory (hyperventilatory) compensation. The high anion gap helps identify the cause as a high anion gap metabolic acidosis, rather than a normal gap one, and the overall picture matches a primary metabolic acidosis with respiratory compensation.

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