Lead II




Interpretation rules

  • Broad QRS complex (≥ 120 ms) with abnormal morphology.
  • Premature — i.e. occurs earlier than would be expected for the next sinus impulse.
  • Discordant ST segment and T wave changes.
  • Usually followed by a full compensatory pause.
  • Retrograde capture of the atria may or may not occur.
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