Please note: reference image is displayed in place of Flash media.
The heart’s “natural” pacemaker is called the sinoatrial (SA) node or sinus node and is located in the right atrium. It produces electrical impulses that make your heart beat. The signal first stimulates the atria (upper chambers) to contract and pump blood into the ventricles (lower chambers). For your heart to beat properly, the signal must travel from the SA node down a specific path to reach the ventricles. As the signal goes from the atria to the ventricles, it passes through specialized conducting tissue called the atrioventricular (AV) node. Sometimes the electrical signal from the heart’s upper to lower chambers is impaired or doesn’t transmit. This may occur in the conduction pathway or in the AV node. This is “Heart Block” or “AV block”. Heart block is classified according to the level of impairment — first-degree heart block, second-degree heart block or third-degree (complete) heart block. (Also known as AV Block.)
©2019 Medmovie.com. All rights reserved. Medmovie.com creates and licenses medical illustrations and animations for educational use. Our goal is to increase your understanding of medical terminology and help communication between patients, caregiver and healthcare professionals. The content in the Media Library is for your information and education purposes only. The Media Library is not a substitute for professional medical advice, diagnosis or treatment for specific medical conditions.