End-tidal CO2, or EtCO2, is used to monitor the concentration of carbon dioxide in exhaled air to assess vital signs. It can be a crucial tool for ensuring optimal, high-quality chest compressions during cardiac resuscitation. It is commonly used in emergency medical care and as an essential device for long-term monitoring. Comdek uses end-tidal CO2 (capnography) monitoring to determine exhaled carbon dioxide (EtCO2) and respiratory rate, helping to determine intubation placement and assist physicians in assessing the depth and effectiveness of chest massage.