Please note: reference image is displayed in place of Flash media.
Sinus rhythm is referred to as the “normal” heart rhythm. It represents the pattern of electrical activity that is seen on an electrocardiogram (ECG or EKG) when the heart is beating normally. An ECG is a routine test that records the electrical activity of the heart, using electrodes placed on the surface of the skin. A normal ECG has identifiable waves in each cycle that are named the P wave, QRS complex, and T wave. The P wave is associated with activity in the atria (upper chambers of the heart); the QRS and T wave are associated with activity in the ventricles (lower chambers of the heart).
The electrical system of the heart is made up of several parts that communicate with one another to signal the heart muscle fibers to contract. The impulse is initiated by the sinoatrial node (SA node) which is located in the right atrium. The electrical impulse travels through the atria (causing them to contract) to the AV node and on through the bundle of His and the bundle branches located within the ventricles which causes the ventricles to contract. This flow of electrical signals produces a normal heartbeat or normal heart rhythm called “sinus rhythm.”
©2021 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.