Lecture 7 - Coronary circulation & conduction systems Flashcards Preview

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Flashcards in Lecture 7 - Coronary circulation & conduction systems Deck (27):
1

The right and left coronary originate from...

ascending aorta - just above the aortic semilunar valve

2

Where does the Right coronary artery run?

in the right aV groove - wraps around posteriorly

3

What branches does the Right coronary artery give off?

porterior IV branch

and

marginal artery

and

very small arteries going to the atrium - SA nodal branch, posteriorly AV nodal branch

4

Where does the Left coronary artery run?

postgerior to the pulmonary trunk - as it goes lateral we can see it in the left AV groove.
As soon as it gets past the trunk it divides into the circumflex (in AV groove) and ant. IV branch.

5

What are the Left coronary a. divisions?

As soon as it gets past the trunk it divides into the circumflex (in AV groove) and ant. IV branch.

there is a marginal branch that comes off the circumflex

6

Depending on which coronary artery the ____ _-_branch comes off determines whether the left or right is the dominant

Depending on which coronary artery the posterior IV branch comes off determines whether the left or right is the dominant

7

Which coronary supplies the SA and AV node?

Right coronary

but not always

8

Generally speaking Left coronary does which chambers?

left atrium and most of left ventricle (doesn't do diaphragmatic part)

9

True or False

are the coronaries anatomical end arteries?

False

They are function end arterioes - anatastomose in 2 places

if there is a slow occlusion, they open up and communicate

10

Where do the coronaries anastomose?

1 -- just behind the apex - the IV arteries

2 - on the posterior surface where the circumflexes meet

11

Coronary heart disease casues tissue diease which causes the release of _______ ________ which stimulate pain and cause ineffective blood pumping

Coronary heart disease casues tissue diease which causes the release of inflammatory mediatores which stimulate pain and cause ineffective blood pumping

12

Angiography involves ____ with contrast injected

X-ray

13

What is Angioplasty?

Inserting an inflatable balloon which aims to open to the artery. If there is a chance it will open again a stent is used it keep it open?

14

If openings are so blocked up, and can;t be opened, a bypass surgery is required, what does this involve?

Taking a vein (ususally) and putting it from aorta to spot distal from blockage - saphenous vein, int. mammary art., radial art. commonly used

15

Where does the coronary sinus sit?

in the posterior AV groove

16

Which vein runs wit the ant IV artery?

Great cardiac vein - as we come posterior becomes middle cardiac vein

17

Which vein runs in the posterior IV groove?

middle cardiac vein

18

Which vein runs iwth the right marginal artery?

Small cardiac vein

19

Which vein drains the left atrium?

oblique vein

20

Where does the AV node sit?

lower part of the right atria

It is located at the center of Koch's Triangle—a triangle enclosed by the septal leaflet of the tricuspid valve, the coronary sinus, and the membraneous part of the interatrial septum

21

From the AV bndle (bundle of His) what comes off?

Left bundle branch
- goes to left ventricle

Right bundle branch
-(from this theres the moderator band)
-The right bundle moves through the exagerrated papillary muscle
- The bundle splits up inferiorly and arch back up to innervate the ventricles

22

Will the AV node produce pulses in the absense of the SA node?

yes - it is usually the dominant pacemaker

23

Where does the SA node sit?

Anterior surface of the RA just beneath the SVC

24

Which node is the intrinsic node?

SA node - even without any input will beat about 70 bpm

25

Damage to the SA node can be compensated for by the ___ node's intrinsic action - we can survive in this state

Damage to the SA node can be compensated for by the AV node's intrinsic action - we can survive in this state

26

What happens if AV node is stopped?

big problem, no impulses carried to the ventricles = heart block

- SA activity can no longer reach the ventricles

27

What is the path of a pacemaker?

Subclavian vein SVC - RA - into ventricles

- stimulation passes directly into the ventricle