During a medical emergency, what is the first action staff should take?

The correct first action to take during a medical emergency is to call for "A" team responders. This is because the "A" team is typically composed of trained individuals equipped to handle emergencies quickly and effectively. Their immediate presence is vital to stabilize any medical situation and provide urgent care. Recognizing that time is of the essence in medical emergencies, the focus is on ensuring that qualified personnel, who have the necessary skills and equipment, are dispatched to the scene as soon as possible.

While calling for medical staff may also be important, "A" team responders are specifically designated to address emergencies and will likely be the first to provide immediate assistance. Other options like requesting video footage or emergency keys, or contacting a supervisor, could be necessary at some point but are secondary to the immediate need for direct medical aid. In a life-threatening situation, prioritizing the arrival of trained emergency responders is the most crucial step to ensure effective intervention.