Lecture 7 - Coronary circulation & conduction systems Flashcards
The right and left coronary originate from…
ascending aorta - just above the aortic semilunar valve
Where does the Right coronary artery run?
in the right aV groove - wraps around posteriorly
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
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.
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
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
Which coronary supplies the SA and AV node?
Right coronary
but not always
Generally speaking Left coronary does which chambers?
left atrium and most of left ventricle (doesn’t do diaphragmatic part)
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
Where do the coronaries anastomose?
1 – just behind the apex - the IV arteries
2 - on the posterior surface where the circumflexes meet
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
Angiography involves ____ with contrast injected
X-ray
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?
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
Where does the coronary sinus sit?
in the posterior AV groove
Which vein runs wit the ant IV artery?
Great cardiac vein - as we come posterior becomes middle cardiac vein
Which vein runs in the posterior IV groove?
middle cardiac vein
Which vein runs iwth the right marginal artery?
Small cardiac vein
Which vein drains the left atrium?
oblique vein
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
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
Will the AV node produce pulses in the absense of the SA node?
yes - it is usually the dominant pacemaker
Where does the SA node sit?
Anterior surface of the RA just beneath the SVC
Which node is the intrinsic node?
SA node - even without any input will beat about 70 bpm
