What indicates the greatest improvement in a client recovering from acute respiratory distress syndrome (ARDS)?

The indication of the greatest improvement in a client recovering from acute respiratory distress syndrome (ARDS) is reflected in the partial pressure of arterial oxygen (PaO2) reading alongside the absence of infiltrates. An arterial oxygen level of 84 mm Hg is within an acceptable range, suggesting improved oxygenation. Furthermore, the absence of infiltrates on imaging implies that the lung pathology associated with ARDS, such as fluid accumulation and injury to the alveolar-capillary membrane, is resolving. This combination indicates a significant improvement in lung function and oxygen exchange capability.

In ARDS, resolution of infiltrates suggests that the inflammation and damage to the lungs are decreasing, promoting recovery. Monitoring both oxygen levels and the presence of infiltrates helps assess the patient's progress, making this option indicative of a favorable recovery trajectory.

Overall, both the adequate oxygenation and cleared lung fields represent positive changes in a patient’s condition, highlighting a notable improvement in their respiratory status.