This site is intended for healthcare professionals

Go to /sign-in page

You can view 5 more pages before signing in

PR prolongation

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

The reference range for the PR interval is between 0.2 sec (5 little squares) and 0.12 sec (3 little squares).

The PR interval represents the time taken for activation to pass from the sinus node, across the atrium, through the AV node into the Purkinje system and finally to activate the ventricles.

Related pages

Create an account to add page annotations

Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page