Final answer:
Immediately resume chest compressions after delivering a shock with an AED, as per current resuscitation guidelines.
Step-by-step explanation:
After using an Automated External Defibrillator (AED) to deliver a shock to a cardiac arrest patient, resume chest compressions immediately. Following current resuscitation guidelines, chest compressions should be started right after the shock is administered, without checking for pulse or initiating artificial ventilations. Compressions should continue until the AED prompts to stop and reanalyze the patient's heart rhythm. The emphasis is on quick resumption of chest compressions to maintain circulation and increase the chances of a successful resuscitation.