Sinus rhythm (a.k.a. normal sinus rhythm) refers to the normal heart beat originating from the sinoatrial node. This is manifested as an upright P wave in lead II of the ECG. Sinus bradycardia ...

To understand the difference between normal sinus rhythm and sinus arrhythmia, it's best to start by exploring the role of an electrocardiogram (ECG or EKG) in diagnosing such rhythms. During an ...

This results in an upright P wave in lead II on the ECG. If there is a P wave before every QRS complex, and it has a sinus morphology, then normal sinus rhythm, or NSR, is said to be present.

ECG interpretation ... further evaluation needed. Normal ECGs include common, training-related findings in athletes such as high QRS amplitude meeting voltage criteria for left ventricular hypertrophy ...

The ability to identify an abnormality on the 12-lead ECG, suggestive of underlying cardiac disease associated with sudden cardiac death (SCD), is based on a sound working knowledge of the normal ECG ...

There is no associated P wave, although an independent normal P wave may precede, be within or follow the VPC. Prematurity of an ectopy is determined by the intrinsic escape rhythm of the ectopic ...