Which shock is produced by bacteria and toxins in the bloodstream that lead to vasodilation and increased capillary permeability?

• A. Cardiogenic Shock
• B. Non-Hemorrhagic Shock
• C. Distributive Shock
• D. Septic Shock

Answer: (D)

The key idea is that infection in the bloodstream triggers a systemic inflammatory response that causes widespread vasodilation and leakage of fluid from capillaries. Bacterial toxins activate immune cells to release cytokines and mediators like nitric oxide, leading to reduced vascular resistance and increased capillary permeability. This combination lowers blood pressure and impairs tissue perfusion, which is the hallmark of septic shock. It’s a form of distributive shock caused specifically by infection, distinguishing it from other types where the problem is not the inflammatory response to bacteria (for example, cardiogenic shock is due to pump failure, not infection-driven vasodilation).