prolonged PR interval

Last edited 06/2020 and last reviewed 06/2020

In first degree heart block there is a delay in the conduction pathway from the sino-atrial node to the ventricles. This is illustrated on an ECG as a PR interval of greater than 0.2 seconds.

A finding of first degree heart block may have no pathological significance. However it may be a sign of underlying disease.

Click here for a link to ECG findings and further explanation