Glossary of Intro to Cardiology
Other Decks By This User
- List the major branches of the Coronary arteries
- 1. Left main coronary artery:
--> Left anterior descending gives rise to septal perforators (penetrates IV septum) and diagonal branches (along surface of heart)
--> Circumflex Artery gives rise to obtuse marginal branches (provide flow to lateral wall, or obtuse margin of heart)
2. Right coronary artery gives rise to posterior descending artery (90% dominant) (runs along posterior aspect of IV septum, feeding posterolateral wall of LV)
- What does the LAD Artery supply?
- LAD: runs along front of heart, wraps around the apex
Supplies the entire anterior and apex of the LV
--danger of rupture in transmural MI
--prone to mural thrombosis in anterior MI
Supplies anterior IV septum
--Danger of permanent BBB in anterior MI
--Permanent pacemaker is often required
- What does the RCA supply?
- RCA: leaves the aorta anteriorly, runs down anterior atrioventricular groowve giving rise to RV branches
Supplies the entire posterior and inferior part of the left ventricle, including posterior 1/3 of IVS (if R-dominant coronary circ): responsible for epigastric pain in MI
Supplies the entire right ventricle: right ventricular infarction
Supplies the posteromedial papillary muscle: danger of papillary muscle rupture and mitral regurgitation in MI
Supplies most of the blood to the AV node: danger of sinus bradycardia
- What does the Left circumflex supply?
- Left Circumflex: runs posteriorly in atrioventricular groove
Supplies lateral wall of left ventricle
Can also supply posterior wall if Left dominant coronary circulation
- What artery is affected in an ANTERIOR infarct?
- Left Anterior Descending Artery
- What artery is affected in an ANTEROLATERAL infarct?
- Occlusion of Left circumflex, marginal branch of left circumflex, or diagonal branch of Left anterior descending
- What artery is affected in a DIAPHRAGMATIC or INFERIOR infarct?
- Occlusion of right coronary artery
- What artery is affected in a TRUE POSTERIOR infarct?
- Occlusion of posterior descending of distal right coronary artery
Occlusion of distal circumflex art
- In Right Heart Dominance, which vessels provides a majority of the flow to the inferior and posterior walls of the left ventricle?
- 90% of the time RCA s dominant, supplying the majority of the flow to the inferior and posterior walls of the LV
- In Left Heart Dominance, which vessels provides a majority of the flow to the inferior and posterior walls of the left ventricle?
- About 10% of the time, RCA is very small, and LCX which runs posteriorly in the atrioventricular groove, continues in the groove all the way to the back of the heart
In this case: Left Coronary artery is dominant
--> Occlusion of LCX will have much more serious consequences b/c you'll knock out:
1) majority of the flow to the inferior and posterior walls
2) the lateral wall, or obtuse margin of the heart(obtuse marginal branch of LCX)
- Who provides bloodflow to the Sinus node?
- SA Node blood flow:
RCA: 55% of the time
LCA: 45% of the time
- Who provides bloodflow to the AV node?
- AV Node blood flow:
RCA: 90% of the time
LCA: 10% of the time
- Where is the sinus node located?
- SA node is located at the junction of the SVC and right atrium
- Explain the functional divide of the AV node
- AV node has a slow and fast pathway - these are anatomically unique structures with different electrical properties
Fast pathway conducts quickly and repolerizes slowly and v/v
This provides substrate for abnormal cardiac rhythms
- What is the role of the Papillary muscles?
- The papillary muscles shorten to help adjust the valve leaflet position to accomodate and seal off a smaller sized atrioventricular orifice and ventricular chamber length during systole
Papillary muscle defects can lead to regurgitation at the AV valves
- Tricuspid Leaflets
- Anterior Cusp
- Mitral Leaflets
- Anterior Cusp
- Pulmonic leaflets
- Anterior semilunar Cusp
Right semilunar Cusp
Left semilunar Cusp
- Aortic Leaflets
- Left semilunar Cusp
Right semilunar Cusp
Posterior semilunar Cusp
- Inter-valve/ Cusp Relationships
- Tricuspid septal cusp shares fibrous trigone with anterior cusp of mitral valve
Mitral valve anterior cusp also shares fibrous trigone with posterior aortive semilunar cusp
Left Pulmonic cusp next to left aortic
Right pulmonic cusp next to right aortic
You must Login or Register to add cards