EP Device Implant v2.3 Education-Normal Conduction

Video Transcription

Before we look at the abnormal, let's talk about normal conduction. Normal conduction begins with the activation of the SA node and transmits the signal across  both the right and left atrium, resulting in atrial contraction. The signal then travels to the AV node. At the AV node, there is a delay of about 120 milliseconds.  Before the signal travels through the bundle of His, and splits into the right and left bundle branches. The left is activated slightly before the right.  Next, the left bundle splits into the left and anterior fascicles. From there, the signal spreads into the Purkinje fibers of the left and right ventricle, resulting  in ventricular contraction. SA node dysfunction, or AV node disease, can lead to a disruption in the conduction system  of the heart requiring the implantation of a permanent pacemaker.

Video Summary

This video discusses the normal conduction of the heart and how abnormalities in the conduction system can lead to the need for a permanent pacemaker. The video explains that normal conduction starts with the activation of the SA node, which then transmits the signal across the atria and to the AV node. After a delay at the AV node, the signal travels through the bundle of His and splits into the right and left bundle branches, followed by the left bundle splitting into the left and anterior fascicles. Finally, the signal spreads into the Purkinje fibers in the ventricles, causing ventricular contraction. SA node dysfunction or AV node disease can disrupt this conduction system and necessitate a pacemaker implantation.

Keywords

heart conduction

abnormalities

permanent pacemaker

SA node dysfunction

AV node disease