How should Amy position Theo's airway using the head-tilt/chin-lift technique?

In the head-tilt/chin-lift technique, the goal is to open the airway of an unconscious individual by repositioning the structures of the neck and jaw. The correct approach involves positioning the head in a way that achieves a slight extension at the neck, which is referred to as "slightly past neutral." This means that the head is tilted back just enough to allow the tongue to fall forward and clear the airway without causing potential obstruction from the neck structure itself.

By placing the airway in this position, it facilitates better airflow and reduces the likelihood of the tongue blocking the airway, which is particularly crucial in situations where the individual is unresponsive. This technique is a standard practice in basic life support as it allows for efficient breathing or ventilation without creating risk of further obstruction.

The other options would not be effective in maintaining an open airway. A flat position might not sufficiently open the airway, slightly lifted may not achieve the desired angle for airway clearance, and fully extended could potentially lead to hyperextension, which may compress cervical structures or again result in airway obstruction. Thus, slightly past neutral is the ideal position for optimal airway management.