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AV Conduction: Difference between revisions
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==First degree AV block== | ==First degree AV block== | ||
[[Image:Rhythm_1stAVblock.png|thumb| 1st degree AV block. Although the PQ interval is prolonged, all P waves are followed by QRS complexes: there is no dropout of complexes]] | [[Image:Rhythm_1stAVblock.png|thumb| 1st degree AV block. Although the PQ interval is prolonged, all P waves are followed by QRS complexes: there is no dropout of complexes]] | ||
In first degree AV block there is a prolongation of PQ duration (PQ time > 0. | In first degree AV block there is a prolongation of PQ duration (PQ time > 0.22 sec). Still every P wave is being followed by a QRS complex. | ||
First degree AV block is present in 16% of >90-year olds <cite>kelley</cite> and is mostly caused by a degeneration of the conduction system. First degree AV block is relatively harmless. | First degree AV block is present in 16% of >90-year olds <cite>kelley</cite> and is mostly caused by a degeneration of the conduction system. First degree AV block is relatively harmless. | ||
{{clr}} | {{clr}} | ||
==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: | ||