Final answer:
Obstructive shock occurs when a significant portion of the vascular system is blocked. Treatments depend on the underlying cause and may involve administering fluids, anticoagulants, and surgery as required.
Step-by-step explanation:
Obstructive shock, also known as ductal dependent shock, occurs when a significant portion of the vascular system is blocked. The most common cause is a pulmonary embolism, where a clot lodges in the pulmonary vessels and interrupts blood flow. Other causes include stenosis of the aortic valve, cardiac tamponade, and pneumothorax. Treatments for obstructive shock depend on the underlying cause and may involve administering intravenous fluids, anticoagulants, surgical removal of fluid or air, and surgery as required.