Advanced Left Coronary Artery Quiz

Q1. A proximal occlusion of the left coronary artery before its major division could directly compromise which combination of arterial territories?

• Right marginal territory only
• Posterior interventricular territory only in every heart
• Anterior interventricular and circumflex territories
• Right atrial territory exclusively

Q2. Why can proximal anterior interventricular artery occlusion cause major conduction abnormalities?

• The artery is part of the fibrous skeleton of the heart
• Septal branches supply important portions of the ventricular conduction system
• The artery carries impulses from the vagus nerve
• The artery directly forms the sinoatrial node

Q3. An occlusion involving the diagonal branches of the anterior interventricular artery would most directly threaten which region?

• Interatrial septum exclusively
• Pulmonary valve
• Posterior wall of the right atrium
• Anterolateral wall of the left ventricle

Q4. A lesion of the circumflex artery proximal to its left marginal branch most directly threatens which ventricular region?

• Right atrial appendage exclusively
• Posterior one-third of the interventricular septum in every individual
• Lateral wall of the left ventricle
• Anterior wall of the right ventricle exclusively

Q5. In a left-dominant coronary circulation, which branch usually supplies the posterior interventricular artery?

• Circumflex artery
• Anterior interventricular artery
• Right marginal artery
• Conus artery

Q6. Why may circumflex artery occlusion affect the atrioventricular node in a left-dominant heart?

• The circumflex artery becomes the vagus nerve
• The AV node lies inside the circumflex artery
• The AV nodal branch may arise from the dominant circumflex artery
• The AV node is always supplied exclusively by the anterior interventricular artery

Q7. What is meant by a left coronary trifurcation?

• Origin of three left coronary arteries from the pulmonary trunk
• Division into three posterior interventricular arteries
• Division of the circumflex artery into three veins
• Division into anterior interventricular, circumflex, and ramus intermedius branches

Q8. Which vessel commonly accompanies the circumflex artery in the left atrioventricular groove?

• Anterior cardiac veins
• Middle cardiac vein
• Great cardiac vein
• Inferior vena cava

Q9. Which statement best explains why a proximal left coronary artery obstruction can threaten a particularly large myocardial territory?

• It supplies the lungs as well as the entire heart
• It can reduce flow to both the anterior interventricular and circumflex arterial systems
• The left coronary artery is the only artery supplying the right atrium
• It normally carries all venous blood from the myocardium

Q10. Which statement best integrates the anatomy of the left coronary artery?

• It arises from the pulmonary trunk and supplies only the left atrium
• It supplies only the posterior wall of the right ventricle
• It arises from the left aortic sinus and divides into major branches supplying extensive left ventricular and septal territories
• It is a venous structure that drains directly into the coronary sinus