Which statement best defines MODS?

• A. Failure of multiple organ systems with mortality increasing as more organs fail
• B. Failure of a single organ with full recovery
• C. Rapid spontaneous resolution of organ dysfunction
• D. Progressive improvement in organ function

Answer: (A)

MODS refers to the failure of two or more organ systems in a severely ill patient, driven by a systemic inflammatory or physiologic insult. The key point is that mortality rises as more organs fail, so the illness is defined by the involvement of multiple organs rather than a single organ failing. This pattern often follows severe sepsis, trauma, pancreatitis, burns, or major surgery, where inflammatory mediators and microcirculatory dysfunction lead to progressive organ dysfunction such as respiratory failure, acute kidney injury, liver dysfunction, or coagulopathy.

In contrast, failure of a single organ with full recovery, rapid spontaneous resolution, or progressive improvement in organ function does not meet the definition of MODS, since the defining feature is the involvement of multiple organ systems and the associated rising risk of death as the number of failing organs increases.