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PR interval

  • , Last updated 14/10/2021

Cite this article as:

. PR interval, Don't Forget the Bubbles, 2021. Available at: https://doi.org/10.31440/DFTB.5739

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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.

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