Which artery is cited with an example of 80% occlusion due to plaque?

Which artery is cited with an example of 80% occlusion due to plaque?

• A. LAD
• B. RCA
• C. LCx
• D. PDA

Answer: (A)

This question tests how the impact of a plaque depends on where it sits in the coronary tree. A high-grade, about 80% narrowing is considered a significant lesion, and the left anterior descending artery is the vessel that supplies a large portion of the left ventricle, including the anterior wall and much of the septum. Because it serves such a large territory, an 80% plaque there tends to produce meaningful ischemia or be highlighted as a classic example in teaching diagrams and exams. The other arteries can harbor plaques too, but the LAD’s large myocardial area at risk makes it the standard reference for a substantial lesion in this context.

This question tests how the impact of a plaque depends on where it sits in the coronary tree. A high-grade, about 80% narrowing is considered a significant lesion, and the left anterior descending artery is the vessel that supplies a large portion of the left ventricle, including the anterior wall and much of the septum. Because it serves such a large territory, an 80% plaque there tends to produce meaningful ischemia or be highlighted as a classic example in teaching diagrams and exams. The other arteries can harbor plaques too, but the LAD’s large myocardial area at risk makes it the standard reference for a substantial lesion in this context.