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AV Conduction: Difference between revisions
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→Second degree AV block type I (Wenckebach)
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In second degree AV block not all p-waves are being followed by QRS complexes: beat dropout occurs. Second degree AV block can be categorized in 3 types: | In second degree AV block not all p-waves are being followed by QRS complexes: beat dropout occurs. Second degree AV block can be categorized in 3 types: | ||
===Second degree AV block type I (Wenckebach)=== | ===Second degree AV block type I (Wenckebach)=== | ||
[[Image:Wenckebach.png|thumb|Example of type I second degree AV block (Wenckebach)]] | |||
In second degree AV block type I, the PQ interval prolongs from beat to beat up until the drop-out of one QRS complex. The characteristics of a Wenkebach block: | In second degree AV block type I, the PQ interval prolongs from beat to beat up until the drop-out of one QRS complex. The characteristics of a Wenkebach block: | ||
* QRS complexes cluster (e.g. a 5:4 block or 4:3 block) | * QRS complexes cluster (e.g. a 5:4 block or 4:3 block) | ||