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ECG PR interval

ECG segment joining P wave & the QRS complex, corresponding to the period of conduction through the AV node. Clinical significance: - Normal: 120-200 msec - PR segment elevation - atrial infarction - PR segment depression - acute pericarditis - shortened PR interval - WPW syndrome - AV junctional rhythm - HTN (occasional) - Lown-Ganong-Levine syndrome - glycogen storage disease - Fabry's disease - pheochromocytoma - prolonged PR interval - AV block (also see 1st degree AV block) - endocarditis with extension in the aortic valve annulus & formation of a pericardial abscess - endocarditis with acute aortic insufficiency increases left ventricular filling pressure diminishing cardiac output resulting in pulmonary edema & systemic hypotension - hyperthyroidism - normal variation

Related

electrocardiogram (ECG, EKG)

General

electrocardiogram feature

References

  1. Current Pocket Reference 1992 Pharmacopoeia & Medical Notes, Shepherd/Whalen, Specialty Cards, Norman OK 1997
  2. Harrison's Principles of Internal Medicine, 13th ed. Companion Handbook, Isselbacher et al (eds), McGraw-Hill Inc. NY, 1995, pg 329
  3. Cheng S et al Long-term Outcomes in Individuals With Prolonged PR Interval or First-Degree Atrioventricular Block JAMA. 2009;301(24):2571-2577. PMID: 19549974 http://jama.ama-assn.org/cgi/content/short/301/24/2571
  4. NEJM Knowledge+