I recently took a BLS CPR class to renew my cert and the instructor told us that after some time if the patient has no chest rise and fall and the object is still there, that ALS will insert an advanced airway and just push the object into the lungs. 1. If there's no ALS (I'm an EMT) do we just insert and OPA in this case? 2. How long do we wait until inserting an airway?