Lead II





Interpretation Rules

  • Narrow QRS complex, either (1) without a preceding P wave or (2) preceded by an abnormal P wave with a PR interval of < 120 ms (these “retrograde” P wave are usually inverted in leads II, III and aVF).
  • Occurs sooner than would be expected for the next sinus impulse.
  • Followed by a compensatory pause.
  • PJCs that arrive early in the cycle may be conducted aberrantly, most commonly with a RBBB morphology.
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