Hypercarbia is defined as which of the following?

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Prepare for the AACN Essentials of Critical Care Nursing Test. Study with multiple choice questions and thorough explanations. Ace your test effortlessly!

Multiple Choice

Hypercarbia is defined as which of the following?

Explanation:
Hypercarbia means there is more carbon dioxide in the blood than normal. Normal arterial CO2 is about 35–45 mmHg, and when ventilation is inadequate—such as with hypoventilation, airway obstruction, certain lung diseases, or depressants—the CO2 builds up. This excess CO2 drives respiratory acidosis because CO2 combines with water to form carbonic acid, lowering the blood pH. Clinically and on labs, you'd see elevated PaCO2; often the pH is reduced, and bicarbonate may rise if the imbalance is chronic as the kidneys compensate. The other options don’t fit: decreased CO2 is hypocapnia, increased oxygen level isn’t about CO2, and decreased oxygen describes hypoxemia.

Hypercarbia means there is more carbon dioxide in the blood than normal. Normal arterial CO2 is about 35–45 mmHg, and when ventilation is inadequate—such as with hypoventilation, airway obstruction, certain lung diseases, or depressants—the CO2 builds up. This excess CO2 drives respiratory acidosis because CO2 combines with water to form carbonic acid, lowering the blood pH. Clinically and on labs, you'd see elevated PaCO2; often the pH is reduced, and bicarbonate may rise if the imbalance is chronic as the kidneys compensate. The other options don’t fit: decreased CO2 is hypocapnia, increased oxygen level isn’t about CO2, and decreased oxygen describes hypoxemia.

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