Irregular RR interval

What it means

Abnormal increased variability in the timing between consecutive R-waves on an electrocardiogram.

Sinus arrhythmia is a variation of normal sinus rhythm that characteristically presents with an irregular rate in which the change in the R-R interval is greater than 0.12 seconds.

Rare diseases that can present with this1

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category