文档介绍：electrocardiogram
(ECG)
1
Excitability
Cellular Excitability:Relationship between transmembrane action potential from single ventricular muscle fiber and excitability of fiber to cathodal stimulation. FRT, Full recovery time; ARP-ERP, effective refractory period; RRP, relative refractory period; SNP, supernormal period.
2
Excitability as a Function of Latency: The changes in action potential amplitude and shape of the upstroke as action potentials are initiated at different stages of the relative refractory period of the preceding excitation.
3
Conductivity
unique property of transmitting action potentials from one cell to adjacent cells
4
Cardiac conduction system
This system includes:
Pacemaker structures
Specialized cunductive fibers
Conductive cardiac muscle tissue
5
6
Atrioventricular conduction system:
The AV node can be divided functionally into three regions: AN (upper, or atrionodal), N (middle, or nodal), and NH (lower, or nodal-His bundle).
7
The Ventricular Conduction System
8
the normal sequence of ventricular depolarization:
the left side of the interventricular septum apex
base endocardium epicardium
9
10