A client with a history of chronic obstructive pulmonary disease (COPD) is admitted with pneumonia. Vital signs include a heart rate of 122 beats/minute, a respiratory rate of 28 breaths/minute, and a blood pressure of 170/90 mm Hg. Which assessment finding warrants the most immediate intervention by the nurse?

A. Yellow expectorated sputum. This is typical in pneumonia, indicating bacterial infection, but it does not require immediate intervention compared to wheezing. B. Shortness of breath on exertion. This is common in COPD and pneumonia, but the wheezing represents a more urgent concern for respiratory compromise. C. Oral temperature of 100.5°F (38.1°C). This is a mild fever, which is common in infections like pneumonia, but it does not warrant immediate intervention like wheezing does. D. Bilateral diffuse wheezing. Wheezing suggests bronchospasm, which could indicate airway obstruction or respiratory distress. This requires immediate attention, especially in a client with COPD and pneumonia, both of which can compromise respiratory function.