What is the term for an artery in which the blood flow has been impaired by a blockage?

The term "occluded artery" refers specifically to an artery that has experienced a blockage that impairs blood flow. This blockage can occur due to various factors such as a buildup of plaque, thrombus formation, or other forms of obstruction that impede the normal circulation of blood. When an artery is occluded, it can have significant consequences for the tissues and organs that depend on that artery for oxygen and nutrients.

The other terms provided do not accurately capture this specific condition. "Open artery" implies that there are no obstructions and blood can flow freely, which is the opposite of the situation described in the question. "Vein obstruction" refers to a blockage in a vein rather than an artery, thus it is not relevant to this context. "Clogged vessel" is a more general term that can refer to either arteries or veins but lacks the specific medical terminology that "occluded artery" provides, making it less precise in terms of describing the condition accurately.