What is the immediate action for an unresponsive young female with slow, snoring respirations after heavy drinking?

In a scenario involving an unresponsive individual with slow, snoring respirations, the priority is to ensure airway patency. The presence of slow, snoring respirations can indicate obstruction, possibly due to the position of the tongue or other anatomical factors. Performing a manual airway maneuver, such as the head-tilt, chin-lift, or jaw-thrust maneuver, helps to open the airway by repositioning the tongue and allowing for better airflow. This immediate action addresses the critical need for maintaining an open airway before other interventions can be considered.

While administering oxygen can be vital for supporting breathing in a patient, it does not address the underlying issue of a potentially obstructed airway. Similarly, determining if drugs are involved or administering positive pressure ventilation are important steps but are secondary to ensuring that the airway is clear if the person cannot maintain it themselves. Thus, performing a manual airway maneuver is the most appropriate first step in this situation.