Sinus arrhythmia refers to a changing sinus node rate with the respiratory cycle, on inspiration and expiration. This is quite common in young, healthy individuals and has no clinical significance.

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 ...

Doctor Ceresnak says, “The key was just trying to document and really get a good EKG recording of an arrhythmia episode.” Heinz then wore his mom’s watch anytime his heart started racing ...