What is the main determinant of etco2 during cpr?

One of the main determinants of end-tidal carbon dioxide (ETCO2) during CPR is cardiac output. ETCO2 levels closely correlate with the amount of blood being circulated by the heart, as carbon dioxide is a byproduct of cellular metabolism that is carried by blood to the lungs for exhalation.

During CPR, if effective chest compressions are being performed and the heart is able to pump oxygenated blood to the vital organs, ETCO2 levels will rise. Conversely, if chest compressions are inadequate or the heart is not functioning properly, ETCO2 levels will decrease.

Monitoring ETCO2 levels during CPR can provide important information about the effectiveness of resuscitation efforts. Low ETCO2 levels may indicate poor cardiac output and the need for adjustments in chest compressions or other interventions to improve circulation. On the other hand, increasing ETCO2 levels can be a sign of successful resuscitation and restoration of normal cardiac function.