Premature junctional complex

ECG Findings

WPW with PJC underlined in red
  • P wave is either:
    • Absent
    • Abnormal with PR < 120ms
    • Retrograde, which may be inverted in inferior leads
  • PJC arrives before next sinus beat
  • Followed by compensatory pause
  • From AV node region, with ventricular response usually normal, so QRS complexes usually narrow
  • If conduction abnormal, may have RBBB morphology

Clinical Significance

  • Less common than PVCs or PACs
  • Differentiate from WPW (short PR)
  • May be seen in healthy individuals with no clinical significance
  • Or in pathology such as valvular disease, drug toxicity, electrolyte disorder

See Also