Species differences Flashcards
1
Q
Classified according to
A
time-order of ventricular activation
2
Q
Category A species
A
dog, Hu, cat, monkey, rat
3
Q
category A depol
A
a) Initial depolarization (5-10ms):
* Endocardial shell surrounding LV apex
* IVS from RV endocardium to LV
b) Depol of both ventricular free walls subendocardial termination of Purkinje fibers → epicardium
c) Terminal depol of basilar portion (LV, RV, IVS) from apex → base
4
Q
Category b species
A
goat, horse, cow, pig, sheep
5
Q
category b ECG
A
a) Initial activation similar to category A
b) Terminal depol of middle/basilar 1/3 of IVS in apex → base direction
* At end of a + start of b: entire ventricular mass depolarize as single burst
o More profound penetration of Purkinje fibers in ventricular muscle
