Which of the following ABG findings is most suggestive of a severe case of congestive heart failure? A)Respiratory alkalosis B)PaO₂ = 40 mmHg C)Metabolic acidosis D)PaCO₂ = 44 mmHg

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Metabolic acidosis is the ABG finding most suggestive of a severe case of congestive heart failure. This is because in severe cases, there is decreased cardiac output leading to decreased perfusion and oxygen delivery to the tissues. This causes anaerobic metabolism and build-up of lactic acid which results in metabolic acidosis. Respiratory alkalosis (A) may be seen in early stages of CHF due to hyperventilation, while an elevated PaO2 (B) and PaCO2 (D) may be seen in response to increased respiratory drive or respiratory compensation. However, these findings alone are not specific to CHF and may be seen in other conditions as well.

Which of the Following ABG Findings Is Most Suggestive of a Severe