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Bradycardia: Difference between revisions
→AV-Block
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==AV-Block== | ==AV-Block== | ||
[[File:AVBlock.jpg]] | |||
===First Degree AV Block=== | ===First Degree AV Block=== | ||
Technically an AV-delay and not a AV block, 1st degree AV block is defined as a prolonged interval between atrial and ventricular activation (>200ms). This delay results from disease in the AV-node or His-Purkinje system. An AV block is not the cause of bradycardia, because every atrial impulse results in conduction to the ventricles. | Technically an AV-delay and not a AV block, 1st degree AV block is defined as a prolonged interval between atrial and ventricular activation (>200ms). This delay results from disease in the AV-node or His-Purkinje system. An AV block is not the cause of bradycardia, because every atrial impulse results in conduction to the ventricles. | ||
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* <b>Mobitz I (Wenkebach)</b>: The Mobitz type I block is characterized by a progressively increased P-Q interval until atrial activation is blocked in the AV-node. Thereafter conduction is restored and this cycle repeats itself. A common finding in the Mobitz I block is that the first prolongation of the PR interval is associated with the largest increase in interval. After this first prolongation of the interval, the interval gradually increases. Usually Mobitz type II block is located at the atrioventricular node and rarely deteriorates to a more severe conduction block. | * <b>Mobitz I (Wenkebach)</b>: The Mobitz type I block is characterized by a progressively increased P-Q interval until atrial activation is blocked in the AV-node. Thereafter conduction is restored and this cycle repeats itself. A common finding in the Mobitz I block is that the first prolongation of the PR interval is associated with the largest increase in interval. After this first prolongation of the interval, the interval gradually increases. Usually Mobitz type II block is located at the atrioventricular node and rarely deteriorates to a more severe conduction block. | ||
* <b>Mobitz II:</b> When atrial activation is blocked, without progressively increasing P-Q interval a Mobitz Type II AV block is present. This sudden failure of AV conduction is an omen of severe conduction disease in usually infra-Hision part of the atrioventricular conduction system. | * <b>Mobitz II:</b> When atrial activation is blocked, without progressively increasing P-Q interval a Mobitz Type II AV block is present. This sudden failure of AV conduction is an omen of severe conduction disease in usually infra-Hision part of the atrioventricular conduction system. | ||
===Third Degree AV Block=== | ===Third Degree AV Block=== | ||
Third degree AV block is complete block of conduction between atria en ventricle. Atrial and ventricular rhythms are complete dissociated. | Third degree AV block is complete block of conduction between atria en ventricle. Atrial and ventricular rhythms are complete dissociated. | ||
==Ventricular Conduction Block== | ==Ventricular Conduction Block== | ||