Sinus rhythm is the term used to describe the normal rhythm of the heart. It is a regular and steady heartbeat that originates from the SA (sinoatrial) node, which is the heart's natural pacemaker located in the right atrium. The electrical impulses generated by the SA node are then conducted through the heart's conduction system, which includes the AV (atrioventricular) node, the bundle of His, the bundle branches, and the Purkinje fibers. This process coordinates the contraction of the atria and ventricles in a synchronized manner, ensuring efficient blood circulation. On an ECG (electrocardiogram), the depolarization and repolarization of the atria and ventricles are represented by three distinct waves, which are the P wave, the QRS complex, and the T wave. The P wave indicates atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave reflects ventricular repolarization. read more >>

Sinus rhythm is the name given to the normal rhythm of the heart where electrical stimuli are initiated in the SA node, and are then conducted through the AV node and bundle of His, bundle branches and Purkinje fibres. Depolarisation and repolarisation of the atria and ventricles show up as 3 distinct waves on ECG.read more >>