SA-exit-blok: verschil tussen versies

Uit ECGpedia
Naar navigatie springen Naar zoeken springen
(Nieuwe pagina: {{Chapter|Sinus node rhythms and arrhythmias}} thumb|Sino-atrial exit block (more precisely: type II second degree SA exit block) [[Image:sa_exit_blok2.png|...)
 
Geen bewerkingssamenvatting
Regel 1: Regel 1:
{{Chapter|Sinus node rhythms and arrhythmias}}
{{Chapter|Sinusritme en aritmiën}}
[[Image:sa_exit_blok.jpg|thumb|Sino-atrial exit block (more precisely: type II second degree SA exit block)]]
[[Image:sa_exit_blok.jpg|thumb|Sino-atrial exit block (more precisely: type II second degree SA exit block)]]
[[Image:sa_exit_blok2.png|thumb|Sino-atrial exit block]]
[[Image:sa_exit_blok2.png|thumb|Sino-atrial exit block]]

Versie van 7 feb 2009 22:45

Dit is onderdeel van: Sinusritme en aritmiën
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]