PR interval

Cite this article as:
Davis, T. PR interval, Don't Forget the Bubbles, 2014. Available at:
http://doi.org/10.31440/DFTB.5739

 

ECG intervals

 

PR interval

 

Prolonged PR interval (first degree heart block) may be normal or be seen in:

  • Viral or rheumatic myocarditis and other myocardial dysfunctions
  • Certain congenital heart disease (Ebsteins, ECD, ASD)
  • Digitalis toxicity
  • Hyperkalaemia

Short PR interval occurs in:

  • Pre‐excitation (eg Wolff‐Parkinson‐White)
  • Glycogen storage disease

 

Variable PR interval occurs in:

  • Wandering atrial pacemaker
  • Wenckebach (Mobitz type 1) second degree heart block.