Final answer:
During CPR, if a patient's ETCO₂ level is 8, the correct action to take is to administer medication.
Step-by-step explanation:
During CPR, the level of ETCO₂, or end-tidal carbon dioxide, is monitored to assess the effectiveness of chest compressions. A normal range for ETCO₂ is around 35-45 mmHg. A reading of 8 mmHg indicates inadequate blood flow and ventilation during CPR. Therefore, the correct action to take in this situation is to 3) Administer medication. Administering medication can help improve the patient's circulation and increase the ETCO₂ level, indicating better blood flow.