Advanced Coronary Circulation Quiz

Q1. Occlusion of the proximal anterior interventricular artery places which part of the interventricular septum at greatest direct risk of ischemia?

• Interatrial septum exclusively
• Entire septum exclusively through the right coronary artery
• Posterior one-third only
• Anterior two-thirds of the interventricular septum

Q2. Why can an anterior interventricular artery occlusion disrupt ventricular conduction?

• It carries venous blood from the conduction system
• Its septal branches supply important parts of the ventricular conduction system
• It forms the sinoatrial node
• It directly supplies the vagus nerves

Q3. In a right-dominant heart, occlusion near the distal right coronary artery may compromise which combination of structures?

• Inferior ventricular myocardium, posterior septum, and AV node
• Pulmonary valve and ascending aorta only
• Left atrial appendage only
• Anterior interventricular septum only

Q4. What is meant by a codominant coronary circulation?

• Both coronary arteries arise from the same aortic sinus
• Both right coronary and circumflex systems contribute substantially to the posterior ventricular circulation
• The right and left coronary arteries have exactly equal diameters
• The anterior interventricular artery is absent

Q5. During which phase of the cardiac cycle is left ventricular coronary perfusion greatest?

• Diastole
• Atrial systole exclusively
• Isovolumetric contraction only
• Peak ventricular systole

Q6. Why is the subendocardial myocardium particularly vulnerable to ischemia?

• It experiences high intramyocardial compression and has substantial metabolic demand
• It receives blood only from cardiac veins
• It lies outside the myocardium
• It contains no coronary vessels

Q7. Which statement best describes coronary arterial anastomoses?

• Anastomoses exist but may be inadequate during sudden major arterial occlusion
• They always prevent myocardial infarction
• No coronary arterial anastomoses exist
• They normally carry only venous blood

Q8. Which vessel is the principal venous companion of the circumflex artery in the coronary sulcus?

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

Q9. Which veins provide a direct microscopic route for venous blood from the myocardium into the cardiac chambers?

• Middle cardiac vein
• Pulmonary veins
• Smallest cardiac veins
• Great cardiac vein

Q10. Which statement best integrates the anatomy of coronary circulation?

• All myocardial regions are supplied equally by both coronary arteries regardless of dominance
• Coronary arteries arise from the pulmonary trunk and drain directly into the left atrium
• Coronary arteries arise from the aortic sinuses, their territories vary with dominance, and most cardiac venous blood returns through the coronary sinus
• All cardiac veins drain directly into the superior vena cava