The ECG criteria to diagnose sinus arrhythmia is a variation of the P-P interval, from one beat to the next, of at least 0.12 seconds, or 120 milliseconds.

Any views expressed above are the author's own and do not necessarily reflect the views of WebMD or Medscape. Cite this: ECG Challenge: Sinus Rhythm, but What Else? - Medscape - Apr 18, 2017.

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. Sinu ...

A properly functioning sinus node regulates the rhythm and speed of a person’s heart. According to the American Heart Association, a typical heart rate should fall within 60–100 bpm at rest.

DEAR DR. ROACH: I am an active 76-year-old man. I became aware of an increase in my resting heart rate in April 2021, going from a resting rate of 48 to 74 beats per minute in a six-day period. It ...

EKG is the more common abbreviation for the test (so as not to be confused with an EEG, a brain scan), but Apple uses ECG to refer to the feature on the Apple Watch. Keep in mind that this test ...

So, although it's termed arrhythmia, it's actually completely normal to have sinus arrhythmia, and we see this in many children and adults. There are also extra beats that can come from the atrium ...

The study found the ECG app on Apple Watch demonstrated 98.3 percent sensitivity in classifying AFib and 99.6 percent specificity in classifying sinus rhythm in classifiable recordings.