As a medical professional with expertise in cardiology, I can explain that sinus rhythm in an ECG report refers to the normal rhythm of the heart. This rhythm is characterized by the initiation of electrical impulses in the SA (Sinoatrial) node, which is the heart's natural pacemaker located in the right atrium. The impulses then travel through the heart's conduction system, including the AV (Atrioventricular) node, the bundle of His, the bundle branches, and the Purkinje fibers. On an ECG (Electrocardiogram), the depolarization and repolarization of the atria and ventricles are represented by three distinct waves: the P wave, the QRS complex, and the T wave. The P wave represents atrial depolarization, the QRS complex signifies ventricular depolarization, and the T wave corresponds to ventricular repolarization. In summary, a sinus rhythm on an ECG report indicates that the heart is beating in a regular pattern, originating from the SA node, which is considered healthy and normal. 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 >>