Answer to Read the Fine Print
Correct answer is A, the right coronary artery. Yes, the stent needed to be placed in the posterior interventricular artery, indicated by arrow 3, but initially the catheter used to deploy the stent had to enter the right coronary artery. The catheter is then threated to the site of the blockage and the stent deployed. This type of question is an example where students can often be led astray if they read the question quickly. Here, the fine print is important. By the way, the middle heart is a left coronary artery dominant heart. This means that the posterior interventricular artery arises from the circumflex artery. This type of coronary artery distribution occurs in approximately 15% of individuals. Most people are right coronary artery dominant.
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Answer to this question is based on material presented in lectures 11 of the Thorax Lecture Series.
= Right coronary a.
= Left anterior descending a.
= Posterior interventricular a.
= Right marginal a.
= Left anterior descending a.