The nurse is caring for a client with pneumonia. Which assessment finding should be prioritized?

Accessory muscle use is the priority finding because it indicates the client is experiencing significant respiratory distress and increased work of breathing. When the primary respiratory muscles are insufficient to maintain adequate ventilation — a concern in pneumonia where alveolar consolidation impairs gas exchange — the sternocleidomastoid, scalene, and intercostal muscles are recruited. This is a warning sign that the client may be approaching respiratory failure and requires urgent assessment and intervention. A respiratory rate of 22 breaths per minute is only mildly elevated; normal is 12 to 20, so this finding warrants monitoring but is not immediately life-threatening. Sonorous rhonchi are low-pitched sounds produced by secretions in larger airways and are expected in pneumonia; they may clear with coughing and are not the most urgent concern. Coarse crackles in the lung bases are also anticipated in pneumonia, reflecting fluid and secretions in the alveoli, but this finding alone does not signal the same level of acute compromise as accessory muscle use. Prioritizing accessory muscle use guides the nurse to intervene before the client's respiratory status deteriorates further.