What is the likely cause of acute respiratory distress syndrome (ARDS) in a patient with severe burns?

• A. Bacterial invasion of the pulmonary parenchyma
• B. Diffuse pulmonary atelectasis
• C. Injury to the alveolar epithelium
• D. Respiratory infection

Answer: (C)

Acute respiratory distress syndrome (ARDS) is characterized by damage to the alveolar-capillary membrane, leading to increased permeability and pulmonary edema. In the context of severe burns, the systemic inflammatory response can significantly contribute to this process. The injury to the alveolar epithelium can be a direct consequence of the inflammatory mediators released in response to the burn injury.

When severe burns occur, the body releases cytokines and other inflammatory markers, which can lead to widespread inflammation, not just locally at the burn site but also affecting distant organs, including the lungs. This inflammatory response can damage the epithelial cells of the alveoli, resulting in impaired gas exchange and the clinical picture associated with ARDS.

In addition to the injury from the inflammatory response, patients with extensive burns may also face complications such as hypovolemia, reduced oxygen delivery, and potential infections, all of which can further compromise lung function. Nevertheless, the direct and primary cause of ARDS in this scenario stems from the injury to the alveolar epithelium due to systemic inflammation triggered by the burns.