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AV Conduction: Difference between revisions
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→Second degree AV block type I (Wenckenbach)
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==Second degree AV block== | ==Second degree AV block== | ||
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 ( | ===Second degree AV block type I (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) | ||
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The conduction disturbance in a type I block originates in the AV node. Isolated second degree AV block type I is relatively benign and not a pacemaker indication. | The conduction disturbance in a type I block originates in the AV node. Isolated second degree AV block type I is relatively benign and not a pacemaker indication. | ||
{{clr}} | {{clr}} | ||
===Second degree AV block type II (Mobitz)=== | ===Second degree AV block type II (Mobitz)=== | ||
[[Image:Rhythm_Mobitz.png|thumb| Second degree AV block type II (Mobitz)]] | [[Image:Rhythm_Mobitz.png|thumb| Second degree AV block type II (Mobitz)]] | ||