Lecture 7: Coronary Circulation Conduction System of the Heart Flashcards Preview

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Flashcards in Lecture 7: Coronary Circulation Conduction System of the Heart Deck (15)
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1

Which coronary artery is usually most dominant?

The right coronary artery

2

Where do the coronary arteries arise from ?

The root of the ascending aorta - sinuses
Superior to semilunar aortic valve
Richest most oxygenated blood

3

What type of end arteries are the coronary arteries?

Functional end arteries
Communication between small arterioles

4

What is coronary heart disease?

Blockage in coronary arteries
Prevent oxygen reaching cardiac muscle
Tissue death results in pain and ineffective pumping of blood

5

What is angioplasty?

When a balloon tipped tube is inserted into the coronary artery and is expanded several times

6

What is angiography?

When dye is injected into the coronary arteries via the abdominal aorta and an X Ray image is taken

7

What is a coronary bypass surgery ?

When the saphenous vein from the leg is used to bypass the blockage in the coronary artery

8

What is a triple bypass?

When the saphenous vein, internal mammary artery (I.e. Internal thoracic artery - branches of subclavian) and radial artery are used to bypass the sites of blockage

9

Where do the great cardiac vein, oblique vein of left atrium, left marginal vein, left posterior ventricular vein and middle cardiac vein drain into ?

Coronary sinus - opening into right atrium

10

Where is the sino atrial node ?

Crista terminalis

11

Where is the atrioventricular node?

Above the AV orifice
Affected by the pace of SA

12

What does the left coronary artery branch into?

Circumflex artery -> left marginal branch
Anterior interventricular branch

13

How can you tell whether a heart is left coronary artery or right coronary artery dominated?

Whether it gives off a posterior interventricular artery to supply the AV node

14

Typically how much of the SA node is supplied by the RCA and how much is supplied by the LCA ?

SA node
RCA - 55%
LCA - 45%

15

Typically how much of the AV node is supplied by the RCA and how much is supplied by the LCA ?

AV node
RCA - 90%
LCA - 10%