Final answer:
The goal at the scene of a cardiac arrest includes performing CPR to maintain circulation and using an AED to correct any arrhythmias, with the ultimate aim of preserving brain function and possibly using controlled hypothermia post-resuscitation.
Step-by-step explanation:
Our goal at the scene of a cardiac arrest is to support circulation and maintain perfusion of essential organs until normal cardiac function is restored. Cardiopulmonary resuscitation (CPR) is a life-saving technique used in such emergencies to manually compress the heart and help it pump blood. Applying pressure to the sternum, specifically between the T4 and T9 vertebrae, allows blood to flow into the pulmonary and systemic circuits, which is vital for brain survival. Moreover, an automated external defibrillator (AED) can potentially correct arrhythmias and allow the heart to resume its normal rhythm. Goals also include using techniques such as controlled hypothermia to reduce cardiac stress post-resuscitation.