In shock, which arterial blood gas abnormality is commonly observed?

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Multiple Choice

In shock, which arterial blood gas abnormality is commonly observed?

In shock, the main issue is inadequate blood flow delivering oxygen to tissues. This circulatory shortfall also disrupts how well oxygen moves from the lungs into the blood, producing ventilation-perfusion mismatch and sometimes shunting. The result is a lower arterial oxygen tension, or hypoxemia, which is commonly seen on arterial blood gas. While patients may hyperventilate and have a low PaCO2, the hallmark ABG finding in shock tends to be reduced PaO2 due to impaired oxygenation. Hypercapnia is less typical unless there’s concurrent respiratory failure, metabolic alkalosis is not an acute ABG pattern in shock, and a normal PaO2 would not reflect the frequent oxygenation problems seen in shock.

In shock, the main issue is inadequate blood flow delivering oxygen to tissues. This circulatory shortfall also disrupts how well oxygen moves from the lungs into the blood, producing ventilation-perfusion mismatch and sometimes shunting. The result is a lower arterial oxygen tension, or hypoxemia, which is commonly seen on arterial blood gas.

While patients may hyperventilate and have a low PaCO2, the hallmark ABG finding in shock tends to be reduced PaO2 due to impaired oxygenation. Hypercapnia is less typical unless there’s concurrent respiratory failure, metabolic alkalosis is not an acute ABG pattern in shock, and a normal PaO2 would not reflect the frequent oxygenation problems seen in shock.

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