Second Degree SA Exit Block: Type I | Conduction Disorders - MedSchool
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Conduction Disorders

Second Degree SA Exit Block: Type I



  • 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.
Last updated on November 15th, 2019