Exam

PR interval

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PR interval, Shortened PR Interval, Prolonged PR Interval, Short PR Interval, Long PR Interval, PR Segment, PR Segment Depression, PR Depression

  • Findings
  • Normal
  1. PR Segment is Isoelectric
  2. Interval: 0.12 to 0.20
  • Causes
  • Prolonged PR Interval
  1. AV Node Block
  2. Hyperthyroidism (occasional)
  3. Normal variant (rarely)
  • Causes
  • Shortened PR Interval
  1. Wolf-Parkinson-White Syndrome (WPW Syndrome)
    1. Always look closely for a Delta Wave in Short PR Interval
  2. AV nodal rhythm (Junctional Rhythm)
  3. Low atrial nodal rhythm
  4. Lown-Ganong-Levine (LGL)
  5. Hypertension
  6. Normal variant
  • Causes
  • PR Depression
  1. Myocardial Infarction involving atrium
  2. Acute Pericarditis (also with downsloping TP segment)