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Conduction Disorders
 
Conduction Disorders
 

Second Degree SA Exit Block: Type I

 
 
 
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Overview

Also known as Wenkebach SA exit block.
Type I second degree sinoatrial exit block occurs when there is progressively delayed SA transmission eventually resulting in a missed P wave due to failure of conduction to the atrial myocardium.
  • Look For

  • Progressively shortened PP intervals, followed by a pause.
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