What triggers the development of ARDS?

• A. Exogenous toxins
• B. Endogenous cytokines
• C. Hypoxemia
• D. Mechanical ventilation

Answer: (B)

The development of Acute Respiratory Distress Syndrome (ARDS) can be significantly triggered by endogenous cytokines. In ARDS, there's an inflammatory response to injury in the lung, and this response is largely mediated by the release of cytokines from immune cells. These endogenous cytokines such as interleukins, tumor necrosis factor-alpha, and others can result in increased vascular permeability, damage to the alveolar-capillary membrane, and the subsequent development of pulmonary edema, all of which are hallmarks of ARDS.

While exogenous toxins and certain factors like hypoxemia and mechanical ventilation can contribute to the severity of ARDS or be part of the clinical scenario, the primary trigger involves the body’s own immune and inflammatory responses as orchestrated by these endogenous cytokines. This makes them crucial in the initial pathophysiology that leads to ARDS.