ATRIAL RHYTHM
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  • R-R interval is regular
  • QRS rate is normal
  • P wave precedes each QRS complex
  • P axis is abnormal
  • P axis remains constant
  • PR interval may be short; up to 0.04 sec less than normal
  • PR interval remains constant

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  • Premature atrial contraction
  • Supraventricular tachycardia
  • Junctional rhythm