Skip Navigation

School of Health Sciences > Practice Learning > Practice Learning Resources

Cardiology Teaching Package

A Beginners Guide to Normal Heart Function, Sinus Rhythm & Common Cardiac Arrhythmias

Sinus Arrhythmia

Sinus Arrhythmia, or "regularly irregular" sinus rhythm, is a variation on sinus rhythm where the P-P interval ( the distance between consecutive P waves) varies by more than 10%.

It can be naturally occurring or due to heart damage.

Causes can be:

There are two examples below of sinus arrhythmia. The first is less obvious than the second.

Image: Sinus Arrhythmia Example 1

Sinus Arrhythmia Example 1

Image: Sinus Arrhythmia Example 2

Sinus Arrhythmia Example 2

Sinus arrhythmia is not commonly seen but the same evaluation procedure is used:

If the answer to the first four questions is "yes", but the answer to the last is "no" then you have sinus arrhythmia.

  • Return to top of document
  • Previous page
  • Next page