Obstructive shock is most directly caused by which condition?

• A. Cardiogenic
• B. Hypovolemic
• C. Septic
• D. Obstructive

Answer: (D)

Obstructive shock happens when something physically blocks blood flow through the heart or lungs, so the heart can still pump but forward flow is limited. This obstruction lowers the amount of blood returning to the heart or leaving the heart, causing reduced perfusion.

In practice, this type of shock comes from conditions like cardiac tamponade, tension pneumothorax, or a massive pulmonary embolism—each creates a mechanical barrier to circulation. The other listed conditions describe different shock mechanisms: cardiogenic shock is from the heart’s pumping ability failing, hypovolemic shock from a severe loss of blood or fluids, and septic shock from infection causing widespread vasodilation. Since obstructive shock is driven by an obstruction to flow, the option reflecting that mechanism is the correct one.