Vessels, Nerves And Conducting System Of The Heart Flashcards
The vessels of the heart are in embedded in what?
Epicardial fat
What does functional end arteries mean?
They have potential anastomoses (no overlap; cannot provide collateral circulation fast enough in situations of block)
When do coronary arteries fill?
During diastole
What are the branches of the ascending aorta?
2 coronary arteries (left and right)
Where do the coronary arteries arise from?
Aortic sinus above their respective valve cusp of aortic valve
Where do coronary arteries deliver nutrients to?
Directly to epicardium and myocardium, and indirectly to the endocardium and subendocardium via diffusion
Where do the coronary arteries course through?
Along the atrioventricular grooves
What artery is the widow maker?
Left anterior descending artery (LADA/AIVA)
What is the most commonly blocked artery in the US?
Left anterior descending artery
What is significance blockage of an artery?
When an artery is more than 50% blocked
What is coronary dominance?
Defined by which of the 2 coronary arteries gives off the posterior interventricular artery (PIVA)
Which usually supplies the AVN
What supplies the AVN?
Posterior interventricular artery (PIVA)
What are the potential anastomoses?
- A. Of the conus- with LAD
- Interventricular septum by septal perforator- LAD with PDA
- Cardiac apex between LAD with PDA
- At the “crux” between LCX and PDA
Where does lymph drainage from the heart go?
Tracheo-bronchial lymph nodes
What artery accompanies the small cardiac vein?
Rt marginal artery
What passes through the moderator band?
Right AV bundle branches
What does the QRS complex signify?
Ventricular depolarization, contraction and atrial repolarization
What does the P interval on an ekg signify?
Atrial depolarization
What does the T wave signify on an ekg?
Ventricular repolarization
How do you determine bpm on an ekg?
Count the squares between each R spike time
Divide 300 by the space between each R.
E.g. 300/4 = 75 bpm
The heart is different of the ANS because?
The sympathetic is post-ganglionic
Receives both Sympathetic and Parasympathetic
What doe the sympathetic innervate on the heart?
Coronary arteries and nodes (SAN)
What plexus supplies the heart?
Cardiac plexus
