What ETCO2 value during CPR is associated with better perfusion and prognosis?

What ETCO2 value during CPR is associated with better perfusion and prognosis?

• A. End-tidal CO2 greater than 30-40 mmHg during CPR
• B. End-tidal CO2 greater than 10-20 mmHg during CPR
• C. End-tidal CO2 less than 5 mmHg during CPR
• D. End-tidal CO2 around 50 mmHg during CPR

Answer: (B)

End-tidal CO2 during CPR tracks how well chest compressions are delivering blood to the lungs and, by extension, how good the overall perfusion is. When forward blood flow is better, more CO2 is transported to the lungs and exhaled, so ETCO2 rises. A value greater than about 10–20 mmHg during ongoing CPR indicates meaningful perfusion and is associated with a higher chance of return of spontaneous circulation and a better prognosis. Very low ETCO2 (around 5 mmHg or less) suggests poor perfusion and worse outcomes. Extremely high ETCO2 (near 50 mmHg) is not typical during CPR unless ROSC is occurring. So the best indicator for better perfusion and prognosis during CPR is ETCO2 above 10–20 mmHg.

End-tidal CO2 during CPR tracks how well chest compressions are delivering blood to the lungs and, by extension, how good the overall perfusion is. When forward blood flow is better, more CO2 is transported to the lungs and exhaled, so ETCO2 rises. A value greater than about 10–20 mmHg during ongoing CPR indicates meaningful perfusion and is associated with a higher chance of return of spontaneous circulation and a better prognosis. Very low ETCO2 (around 5 mmHg or less) suggests poor perfusion and worse outcomes. Extremely high ETCO2 (near 50 mmHg) is not typical during CPR unless ROSC is occurring. So the best indicator for better perfusion and prognosis during CPR is ETCO2 above 10–20 mmHg.