What must be ensured when using an oxygen delivery device to optimize effectiveness?

When using an oxygen delivery device, ensuring a proper fit and flow rate is crucial for optimizing effectiveness. A well-fitting device ensures that oxygen is delivered directly to the patient without significant leakage, which can compromise the amount of oxygen inhaled. Additionally, the correct flow rate is tailored to meet the patient’s specific oxygen needs, whether they require a low or high concentration of oxygen. Inadequate flow rates can result in insufficient oxygen reaching the patient's lungs, hampering their respiratory effort. Thus, the correct fit and appropriate flow rate are essential in maximizing the efficacy of oxygen therapy for patients in need.