Coronary circulation in health and disease.

Question 1

In which layer of the heart do the coronary arteries lie?

Answer 1

Epicardium, send branches to the myocardium.

Question 2

What does the Epicardium of the heart comprise of?

Answer 2

Mainly connective tissue and fat.

Question 3

What does the myocardium consist of?

Answer 3

Muscle.

Question 4

What is Trans mural myocardial infarction?

Answer 4

A myocardial infarction associated with atherosclerosis. Extend through the entire thickness of the heart muscle.

Question 5

What is a Subendocardial myocardial infarction?

Answer 5

As the name implies.

Question 6

Which region of the heart is most vulnerable to ischemia?

Answer 6

Subendocardium. May because of smaller vessels and less collaterals.

Question 7

Divisions and supply of the left coronary artery?

Answer 7

-

Question 8

Divisions and supply of the right coronary artery?

Answer 8

-

Question 9

Where do most of the venous blood in the heart accumilate?

Answer 9

Coronary sinus.

Question 10

How is blood flow to the heart controlled?

Answer 10

Dialation of the Coronary atery is managed.

Question 11

Name the cardiac veins.

Answer 11

Anterior cardiac vein, small cardiac vein, middle cardiac vein, great cardiac vein. All converge to the Coronary sinus.

Question 12

What is the main driving factor behind coronary circulation?

Answer 12

Myocardial oxygen consumption. When this is high there is coronary vasodilation.

Question 13

How much of the cardiac output is siphoned to the heart?

Answer 13

250ml.

Question 14

Mechanisms of blood vessel occlusion.

Answer 14

Mechanical narrowing, plaque rupture.