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Bradycardia: Difference between revisions
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Sick sinus syndrome is an denoter of diseases of inappropriate sinus node responses. These encompass for instance an inappropriate response after tachycardia due to overdrive suppression (which can result in long pauses) or an inadequate response to exercise. A common clinical manifestation of disease of the sinus node is the bradycardia-tachycardia syndrome; where alternating bradycardia and tachycardia arise. | Sick sinus syndrome is an denoter of diseases of inappropriate sinus node responses. These encompass for instance an inappropriate response after tachycardia due to overdrive suppression (which can result in long pauses) or an inadequate response to exercise. A common clinical manifestation of disease of the sinus node is the bradycardia-tachycardia syndrome; where alternating bradycardia and tachycardia arise. | ||
=AV-Block= | ==AV-Block== | ||
==First Degree AV Block== | ===First Degree AV Block=== | ||
Technically a 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 a 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. | ||
==Second Degree AV Block== | ===Second Degree AV Block=== | ||
===Mobitz I (Wenkebach)=== | ====Mobitz I (Wenkebach)==== | ||
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. Usually Mobitz type II block is located at a the atrioventricular node and rarely deteriorates to a more severe conduction block. | 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. Usually Mobitz type II block is located at a the atrioventricular node and rarely deteriorates to a more severe conduction block. | ||
===Mobitz II=== | ====Mobitz II==== | ||
==Third Degree AV Block== | ===Third Degree AV Block=== | ||
=Ventricular Conduction Block= | =Ventricular Conduction Block= | ||