Lecture 7: Coronary Circulation Conduction System of the Heart Flashcards
Which coronary artery is usually most dominant?
The right coronary artery
Where do the coronary arteries arise from ?
The root of the ascending aorta - sinuses
Superior to semilunar aortic valve
Richest most oxygenated blood
What type of end arteries are the coronary arteries?
Functional end arteries
Communication between small arterioles
What is coronary heart disease?
Blockage in coronary arteries
Prevent oxygen reaching cardiac muscle
Tissue death results in pain and ineffective pumping of blood
What is angioplasty?
When a balloon tipped tube is inserted into the coronary artery and is expanded several times
What is angiography?
When dye is injected into the coronary arteries via the abdominal aorta and an X Ray image is taken
What is a coronary bypass surgery ?
When the saphenous vein from the leg is used to bypass the blockage in the coronary artery
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
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
Where is the sino atrial node ?
Crista terminalis
Where is the atrioventricular node?
Above the AV orifice
Affected by the pace of SA
What does the left coronary artery branch into?
Circumflex artery -> left marginal branch
Anterior interventricular branch
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
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%
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%
