Professional and Linguistic Assessments Board (PLAB) Practice Exam

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From which artery does the posterior descending artery arise in right dominant circulation?

Left circumflex artery
Left anterior descending artery
Right coronary artery
Right marginal artery

The correct answer is: Right coronary artery

In right dominant circulation, the posterior descending artery (PDA) typically arises from the right coronary artery (RCA). This anatomical configuration is crucial for the blood supply to the heart's inferior wall, including the interventricular septum and parts of the right and left ventricles. In right dominant individuals, the RCA provides the PDA, ensuring adequate perfusion to these areas. Understanding dominant coronary circulation is vital for interpreting various cardiac conditions and interventions. Left dominant circulation, on the other hand, arises from the left circumflex artery, and in co-dominant scenarios, the PDA may derive from both the RCA and the left circumflex artery, but these are less common vascular configurations compared to the right-dominant type. The other options would not apply here as they pertain to different branches or arteries that do not typically give rise to the PDA in the scenario of right dominance.