In class we were taught that inserting the NPA on the left side is not preferred, but if it does need to be done, the bevel should be cut so that it faces the septum as it would when inserted via the right Nare. Upon reviewing my textbook tonight however, it said to insert the NPA upside down into the left nare so that the bevel faces the septum and to advance it until you meet resistance, than rotate it 180 degrees as you would an OPA. This latter method doesn't seem quite right to me. Thoughts?