Which type of shock is caused by a reduction in circulating blood volume, typically from blood loss?

• A. Burn Shock
• B. Hypovolemic Shock
• C. Anaphylactic Shock
• D. Neurogenic Shock

Answer: (B)

The main idea here is hypovolemic shock, which happens when the amount of blood circulating in the vessels drops, usually from blood loss. When blood volume falls, venous return to the heart (preload) decreases, so the heart can’t pump out as much blood (lower stroke volume and cardiac output). The result is tissues not getting enough oxygen. The body tries to compensate by speeding the heart rate and constricting blood vessels to maintain pressure, but if the volume loss isn’t stopped, perfusion worsens and blood pressure falls. You’ll see signs like a fast, weak pulse, cool or pale skin, rapid breathing, confusion, and, later, low blood pressure and reduced urine output.

The other types involve different mechanisms: burn shock involves fluid shifts from capillary leak after burns; anaphylactic shock is from a severe allergic reaction causing widespread vasodilation and fluid leakage; neurogenic shock results from loss of sympathetic tone (often after spinal injury), leading to vasodilation and pooling of blood. The key distinction is that this question points to a true loss of circulating blood volume, which is the hallmark of hypovolemic shock.