Which of the following nursing diagnoses is appropriate for a patient with pneumonia?

The appropriate nursing diagnosis for a patient with pneumonia is impaired gas exchange. Pneumonia is characterized by inflammation in the lungs, which can result in fluid accumulation and mucous production, potentially leading to reduced oxygenation of the blood. This condition disrupts the normal exchange of oxygen and carbon dioxide in the alveoli, making it more difficult for the body to effectively use oxygen, thereby justifying the diagnosis of impaired gas exchange.

In the context of this patient, the nursing care plan would focus on interventions that enhance lung expansion, promote effective coughing, and ensure adequate oxygenation. These interventions are critical in managing pneumonia and supporting the patient's respiratory function. Monitoring vital signs, especially oxygen saturation levels, would also be part of the ongoing assessment to ensure that gas exchange is improved and maintained.

Other diagnoses such as impaired mobility, risk for injury, or deficient fluid volume may be relevant depending on individual patient circumstances, but they do not specifically address the primary physiological issue associated with pneumonia, which is the compromised gas exchange.