When do you insert an oropharyngeal or nasopharyngeal airway?

In a pre-hospital emergency situation, someone who will most likely require the insertion on an OPA (oralpharyngeal airway) will be a patient who is unable to keep their airway open themselfs, don't have a gag reflex, and don't have any maxiofacial damage. The whole prodecure is quite short and simple. First, establish the patients gag reflex. This can be accomplished brushing the eyelashes since they operate on the same nerve. If the patient "flinches" the a gag reflex is present, if not then one may continue with the OPA. The OPA is inserted "backwards" then turned 180 degrees, forcing the touge out of the airway and ending the with flange resting on the teeth. Typically the patient is then assisted with respirations via a bag valve mask.