Final answer:
During CPR, you aim for an end-tidal CO2 reading of 35-40 mmHg to indicate effective chest compressions; if the number is lower, the quality of CPR may need to be improved.
Step-by-step explanation:
During CPR (Cardiopulmonary Resuscitation), the end-tidal CO2 (ETCO2) reading you are trying to maintain is typically 35-40 mmHg, which reflects the effectiveness of chest compressions and the possibility of return of spontaneous circulation (ROSC). An ETCO2 reading lower than this range may suggest suboptimal CPR quality, insufficient chest compression depth or rate, or a problem with airway management. Practitioners should aim to improve chest compressions and confirm the proper placement of the airway device. It's important to note that the ETCO2 is not the sole indicator of successful resuscitation, but it's a useful guide in conjunction with other clinical signs and monitoring.