In cardiac arrest, after administering epinephrine, the end-tidal CO2 increases from 17 to 35 mmHg. What does this indicate?

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Multiple Choice

In cardiac arrest, after administering epinephrine, the end-tidal CO2 increases from 17 to 35 mmHg. What does this indicate?

End-tidal CO2 reflects pulmonary blood flow and cardiac output. During CPR, the amount of CO2 reaching the lungs depends on how well the heart is pumping. A sudden, large rise in EtCO2 after administration of epinephrine indicates a rapid improvement in circulation, i.e., return of spontaneous circulation. The lungs start receiving more CO2-rich blood again, and that CO2 is exhaled, pushing the reading from a low value (17) up toward a normal range (35). This is not about ventilation changes, sedation, or cooling—those would not produce such a sharp, sustained jump in EtCO2.

End-tidal CO2 reflects pulmonary blood flow and cardiac output. During CPR, the amount of CO2 reaching the lungs depends on how well the heart is pumping. A sudden, large rise in EtCO2 after administration of epinephrine indicates a rapid improvement in circulation, i.e., return of spontaneous circulation. The lungs start receiving more CO2-rich blood again, and that CO2 is exhaled, pushing the reading from a low value (17) up toward a normal range (35). This is not about ventilation changes, sedation, or cooling—those would not produce such a sharp, sustained jump in EtCO2.

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