Final answer:
In the case of a patient with PEA, continue performing high-quality CPR and prepare to use an AED as soon as it becomes available, following either the shock or no shock indications by the device.
Step-by-step explanation:
After verifying the absence of a pulse and initiating CPR with adequate bag-mask ventilation, if the ECG displays pulseless electrical activity (PEA), your next action should be to continue CPR and prepare for defibrillation. PEA indicates that there is electrical activity in the heart but no mechanical heart action (no pulse). Next, you should locate an automated external defibrillator (AED) as quickly as possible.
Once the AED is available, it should be used to analyze the patient's heart rhythm. If the AED suggests a shock is needed, follow the device's instructions to deliver the defibrillation. If no shock is advised, continue providing CPR. High-quality chest compressions should be maintained, with minimal interruptions until the AED is applied or advanced care arrives. Chest compressions should be at least 5 cm deep and at a rate of 100 compressions per minute, following the current CPR guidelines which emphasize the importance of consistent and effective chest compressions to maintain blood flow, especially to the brain.