Final answer:
In a cardiac emergency when CPR is being administered and an AED becomes available, the CPR should continue while the AED is set up and until the AED provides further instruction. The AED's automated system will guide the responders through the appropriate steps for its use.
Step-by-step explanation:
Responding to an Adult in Cardiac Emergency with AED
When performing CPR on an adult and a second trained responder arrives with an Automated External Defibrillator (AED), you should continue to administer CPR while the second responder turns on the AED and follows its prompts. It is essential to work together quickly and efficiently, as the AED will automatically diagnose the patient's heart condition. If the AED advises a shock, ensure that nobody is touching the patient and then deliver the shock as instructed. After the shock, or if no shock was advised, continue CPR until emergency medical services arrive or till the person shows signs of recovery.
In the event of a cardiac emergency, the application of an AED is critical. The device uses an electrocardiogram to analyze the patient's heart rhythm and applies a shock with the appropriate energy and waveform to correct arrhythmias such as ventricular fibrillation. CPR is recommended before the use of an AED to maintain blood flow to the heart and brain until the heart can be defibrillated back into a normal rhythm.