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Sinus Arrhythmia

Sinus arrhythmia

ECG Features:

  • Sinus rhythm w/ beat-to-beat variation in PP interval
  • Normal Pw axis: 0° to +75°
  • Normal Pw morphology:
    • Upright in I, II-aVF
    • Inverted in aVR
    • Upright or biphasic (positive-negative) in III, aVL, V1-V2
    • Same morphology throughout rhythm strip
  • Regularly irregular PP intervals w/ longest & shortest PP intervals varying by ≥160 ms or ≥10%
    • Phasic PP interval change can occur abruptly
Additional Resources
Sinus Rhythm
 

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