JBL Airway Practice Test

An end-tidal carbon dioxide level of 70 mm Hg indicates severe hypercapnia, which is an elevated level of carbon dioxide (CO₂) in the bloodstream. Normal end-tidal carbon dioxide levels typically range from 35 to 45 mm Hg. When levels exceed this range significantly, as in this case, it suggests that the body is retaining CO₂, often due to inadequate ventilation.

In the context of this scenario, a patient exhibiting hypercarbia at this level is likely experiencing respiratory insufficiency or failure. This condition implies that the patient's ventilatory effort is not sufficient to expel the accumulated CO₂, leading to the elevated end-tidal levels. Therefore, the patient is not breathing adequately. This condition might be seen in various situations, including respiratory diseases, neurological deficits, or severe sedation.

Being aware of a patient's end-tidal carbon dioxide is critical because it helps in assessing their respiratory status. In this case, the high level indicates that the patient is hypercarbic and unable to maintain proper ventilation.