Cardio - Anatomy

Question 1

Draw the heart and its key coronary artery anatomy. Include the following arteries in your drawing: LAD, LCA, RCA, Left marginal, LCX, Acute marginal, and PD.

Answer 1

See pg. 253 in First Aid

Question 2

What does the left circumflex coronary artery (LCX) supply?

Answer 2

Lateral and posterior walls of left ventricle

Question 3

What does the left anterior descending (LAD) artery supply?

Answer 3

Anterior 2/3 of interventricular septum, anterior papillary muscle, and anterior surface of left ventricle

Question 4

What does the acute marginal artery supply?

Answer 4

Right ventricle

Question 5

What does the posterior descending/interventricular artery (PD) supply?

Answer 5

Posterior 1/3 of interventricular septum & posterior walls of ventricles

Question 6

What artery usually supplies the SA and AV nodes?

Answer 6

RCA = right coronary artery

Question 7

Define the following circulation in terms of its frequency and coronary artery anatomy: (1) Right-dominant (2) Left-dominant (3) Co-dominant

Answer 7

(1) 85%, PDA arises from RCA (2) 8%, PDA arises from LCX (3) 7%, PDA arises from both LCX and RCA

Question 8

In which coronary artery does occlusion most commonly occur?

Answer 8

LAD = left anterior descending artery

Question 9

What happens to coronary arteries in diastole?

Answer 9

Coronary arteries fill

Question 10

What is the most posterior part of the heart?

Answer 10

Left atrium

Question 11

With what conditions is left atrium enlargement associated? Why does this make sense?

Answer 11

Dysphagia (due to compression of esophagus) & Hoarseness (due to compression of left recurrent laryngeal nerve, a branch of the vagus); Left atrium = most posterior part of heart

Question 12

What is transesophageal echocardiography useful for diagnosing?

Answer 12

(1) Left atrial enlargement (2) Aortic dissection (3) Thoracic aortic aneurysm