What is the primary use of the head-tilt/chin lift maneuver?

The head-tilt/chin lift maneuver is primarily used to open the airway in an unconscious patient. By tilting the head back and lifting the chin, this action helps to reposition the tongue and any soft tissues in the throat, thereby reducing the risk of airway obstruction. This technique is crucial in emergency situations because maintaining a clear airway is essential for effective breathing and oxygenation.

In contrast, checking for a pulse focuses on assessing circulation rather than airway management, securing a C-collar is a procedure for immobilizing the neck and spine in trauma situations, and performing CPR involves chest compressions and rescue breaths, which are both performed after ensuring the airway is clear. Thus, the head-tilt/chin lift maneuver is specifically designed for airway clearance, making it the correct answer.