Medical Gases and Oxygen Flow Rate Practice Test

A nonrebreathing mask is designed to deliver high concentrations of oxygen to patients who require significant respiratory support. The maximum fraction of inspired oxygen (FiO2) that can be delivered by this type of mask is typically in the range of 90-100%. This high level of oxygen delivery is achieved due to the mask's design, which includes a one-way valve that prevents exhaled air from entering the reservoir bag, allowing the patient to breathe in predominantly oxygen from the bag.

The high FiO2 is crucial for patients in critical conditions or those experiencing severe respiratory distress, as it helps to quickly improve their oxygen saturation levels. The delivery of close to 100% oxygen is vital in emergency situations, where rapid treatment is necessary.

Other options reflect lower FiO2 percentages that may be associated with different types of oxygen delivery devices, such as nasal cannulas or simple face masks, which do not provide the same high concentration of oxygen. Therefore, recognizing the capability of a nonrebreathing mask to reach such high oxygen levels is essential for effective patient care in acute respiratory situations.