Final answer:
The initial treatment to dislodge a severe foreign body airway obstruction in a responsive infant involves back slaps.
Step-by-step explanation:
The initial treatment to dislodge a severe foreign body airway obstruction in a responsive infant involves back slaps. If an infant is choking, turning the baby upside down and slapping on the back may dislodge the obstructing object. This can help force the lodged object out of the airway.