SA-exit-blok

Uit ECGpedia
Versie door Drj (overleg | bijdragen) op 7 feb 2009 om 22:54
Naar navigatie springen Naar zoeken springen
Dit is onderdeel van: Sinusritme en sinusaritmie
Sino-atrial exit block (more precisely: type II second degree SA exit block)
Sino-atrial exit block
Sino-atrial exit block

During sino-atrial exit block, the depolarizations that occur in the sinus node cannot leave the node towards the atria. They are blocked. On the ECG this is expressed as a pause. SA exit block can be destinguished from sinusarrest because the pause in SA exit block is a multiple of the P-P interval that preceded the pause.

Three subtypes can be destinguished:[1]

  • Type I second degree (Wenkebach) SA exit block: the P-P interval progressively shortens prior to the pause
  • Type II second degree SA exit block: the pause equals approximately 2-4 times the preceding PP interval
  • Third degree SA exit block: absence of P waves (can only be diagnosed with an sinus node electrode, during electrophysiological evaluation)

References

  1. ISBN:0721605095 [Braunwald]