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Sinus Rhythm

Sinus Rhythm EKG
ECG features:
  • Default heart rhythm; impulses arise from sinus node
  • 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
  • Regular PP interval varying by less than 160 ms or less than 10 percent
  • Atrial rate: 60-100 BPM in adults (or in normal age-specific range)
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Sinus Arrhythmia


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