Sinus Bradycardia

Lead II

 

12-Lead

 

Interpretation Rules

  • Regular rhythm (Sinus in origin) at a rate <60 bpm or age-appropriate rate in children.
  • Each QRS complex is preceded by a normal P wave.
  • Normal P wave axis: P waves should be upright in leads I and II, inverted in aVR.
  • The PR interval remains constant around 120 – 200 ms.
  • QRS complexes are < 120 ms wide (unless a co-existent interventricular conduction delay is present).
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