PR interval
- 1 min read
- 1 chapter
Explore on Lably
ToursExplore Lably’s 3D toursInterpretation
Variations in the PQ interval can be associated with certain medical conditions:
- Duration
- A long PR interval (of over 200 ms) indicates a slowing of conduction between the atria and ventricles, usually due to slow conduction through the atrioventricular node (AV node). This is known as first degree heart block. Prolongation can be associated with fibrosis of the AV node, high vagal tone, medications that slow the AV node such as beta-blockers, hypokalemia, acute rheumatic fever, or carditis associated with Lyme disease.
- A short PR interval (of less than 120ms) may be associated with a Pre-excitation syndromes such as Wolff–Parkinson–White syndrome or Lown–Ganong–Levine syndrome, and also junctional arrhythmia like atrioventricular reentrant tachycardia or junctional rhythm.
- A variable PR interval may indicate other types of heart block.
- PR segment depression may indicate atrial injury or pericarditis.
More in Human body
Anatomical terms of locationStandard terms for unambiguous description of relative placement of body partsPrefrontal cortexPart of the brain responsible for personality, decision-making, and social behaviorPubMedOnline biomedical databaseMucous membraneProtective layer that lines the interior of hollow organsNeuroimagingSet of techniques to measure and visualize aspects of the nervous systemNeuroscientistIndividual who studies neuroscience