585
edits
Cardiac Arrhythmias: Difference between revisions
→Venticle
| Line 50: | Line 50: | ||
===Venticle=== | ===Venticle=== | ||
The ventricle is activated through the dense network of Purkinje fibers originating from the bundle branches. They penetrate the myocardium, but predominantly the endocardium, and are the starting point of the ventricular activation. | The ventricle is activated through the dense network of Purkinje fibers originating from the bundle branches. They penetrate the myocardium, but predominantly the endocardium, and are the starting point of the ventricular activation. | ||
The left ventricular areas first excited are the anterior and posterior paraseptal wall and the central left surface of the interventricular septum. The last part of the left ventricle to be activated usually was the posterobasal area. Endocardial activation of the right ventricle starts near the anterior papillary muscle 5 to 10 msec after onset of the left ventricule. Septal activation started in the middle third of the left side of the interventricular septum, somewhat anteriorly, and at the lower third at the junction of the septum and posterior wall. The epicardial excitation pattern reflected the movements of the intramural excitation wave. | |||
=Mechanisms of Arrhythmia= | =Mechanisms of Arrhythmia= | ||