You mentioned adding nasopharyngeal airways, I would recommend oropharyngeal airways in addition (or as a replacement). They both have their pros and cons, and may be considered interchangeable (in most cases). However, in many years being a paramedic, I often times used oral airways and never once used a nasal one, although both types of airways (and more advanced ones too) were stocked on the ambulance. Just sayin' ...
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