Nevner hvordan CO2 mengden i blod kan brukes til å vurdere ovelevelsesgraden av hjertestans.
Spontan blodsirkulasjon gjenopprettes når EtCO2 er på 27,6 mmHg.
http://www.ncbi.nlm.nih.gov/pubmed/22107764
The mean initial EtCO2 was 18.7 (95%CI = 18.2-19.3) for all patients. Return of spontaneous circulation was achieved in 695 patients (22.4%) for which the mean initial EtCO2 was 27.6 (95%CI = 26.3-29.0). For patients who failed to achieve ROSC, the mean EtCO2 was 16.0 (95%CI = 15.5-16.5).