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Bradyarrhythmias
 
 

Sinus Arrhythmia

 
 
 
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Overview

Sinus arrhythmia occurs physiologically due to changes in intrathoracic pressure and resultant variation in vagal tone through the respiratory cycle.
  • Look For

  • Irregular RR interval
  • Normal PR interval with P waves preceding each QRS complex
  • Normal axis - positive P waves in leads I and II
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