Final answer:
To support circulation in an emergency, chest compressions should be started immediately, and an Automated External Defibrillator (AED) usage is strongly recommended if it has not been used already.
Step-by-step explanation:
The question pertains to procedures for supporting circulation in a medical or emergency setting. To support circulation, one would typically start chest compressions. At this point, use of an Automated External Defibrillator (AED) is strongly recommended if not already implemented. In a situation where someone is unresponsive and not breathing, starting chest compressions promptly is critical for providing the best chance of survival by maintaining blood flow to vital organs until more advanced care is available. The AED is a device designed to provide an electric shock to help the heart re-establish an effective rhythm.