It is the responsibility from the patient to periodically reassess the placing(s) in the therapy for efficiency. The proper placement and positioning with the prongs with the nasal cannula in the nose is critical for oxygen to become delivered. Educate oneself with our Oxygen Therapy Information Package. It is easy https://caidengihgf.isblog.net/5-essential-elements-for-portable-oxygen-concentrator-inogen-33679650