What is the primary purpose of a balloon-expandable stent?

• A. To enhance blood flow through collateral vessels
• B. To repair an aneurysm
• C. To open blocked vessels
• D. To assist in catheter placement

Answer: (C)

The primary purpose of a balloon-expandable stent is to open blocked vessels. These stents are designed to be delivered through a catheter to the site of a blockage within a blood vessel. Once in place, the balloon component of the stent is inflated, which expands the stent and pushes the vessel wall outward, helping to restore proper blood flow. This is particularly important in conditions such as coronary artery disease, where narrowed arteries can restrict blood flow to the heart muscle.

Other options, while related to vascular interventions, do not pertain directly to the intended function of a balloon-expandable stent. Collateral vessels might enhance blood flow, yet they don't directly represent what the stent does. Repairing an aneurysm involves different techniques, like the use of grafts or other types of stents, which are specifically designed for that purpose. Finally, while catheters aid in the delivery of stents, the act of assisting in catheter placement is not the primary function of the stent itself. The correct focus remains on the stent's role in treating blockages.