Certified Respiratory Therapist Practice Exam

When observing that a reservoir bag on a nonrebreathing mask does not deflate during patient inspiration, what should be checked first?

1. Oxygen flow rate

2. Mask for a snug fit

3. Patient's respiratory rate

4. Oxygen saturation levels

The correct answer is: Patient's respiratory rate

In the scenario where a reservoir bag on a nonrebreathing mask does not deflate during patient inspiration, the most appropriate first step is to check the patient's respiratory rate. This is critical because a nonrebreathing mask is designed to deliver high concentrations of oxygen to patients who require respiratory support. If the bag does not deflate, it could indicate that the patient is not drawing the necessary volume of air, potentially signaling either inadequate respiratory effort or obstruction in the airway. Assessing the patient's respiratory rate provides immediate insight into whether the patient is breathing effectively. A normal respiratory rate indicates that the patient is likely breathing well, while a decreased rate may suggest hypoventilation or respiratory distress, which can lead to inadequate oxygenation. The other choices, while relevant, would typically be assessed after first confirming whether the patient is actively breathing. For instance, checking the oxygen flow rate is important if there is concern about oxygen supply but would not directly address the issue of the bag not deflating. Similarly, ensuring the mask fits snugly is vital for effective delivery of oxygen but presupposes that the patient is attempting to breathe adequately. Oxygen saturation levels are critical for evaluating effectiveness but would be assessed in conjunction with conducting a more thorough examination of