Septic shock is best explained by which mechanism?

• A. A local infection with no systemic involvement.
• B. A noninfectious cause of fever.
• C. An infection triggering a systemic inflammatory response with poor tissue perfusion.
• D. Excess fluid overload without infection.

Answer: (C)

Septic shock happens when an infection sets off a body-wide inflammatory response that disrupts normal blood flow and tissue oxygen delivery. Microbial components stimulate immune cells to release lots of cytokines, causing widespread vasodilation and increased capillary permeability. This leads to a drop in effective circulating volume, maldistribution of blood flow, and impaired tissue perfusion, which can cause lactic acidosis and organ dysfunction. This systemic, perfusion-compromising process is what makes septic shock distinct from a localized infection, a noninfectious fever, or fluid overload without infection.