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|Supervisor= | |Supervisor= | ||
}} | }} | ||
=Conduction delay= | |||
[[Image:geleidingssysteem.jpg|thumb| If the conduction system is dysfunctional, the QRS widens beyond 0.12 seconds.]] | [[Image:geleidingssysteem.jpg|thumb| If the conduction system is dysfunctional, the QRS widens beyond 0.12 seconds.]] | ||
If the QRS complex is wider than 0.12 seconds this is mostly caused by a delay in the conduction tissue of one of the bundle branches: | If the QRS complex is wider than 0.12 seconds this is mostly caused by a delay in the conduction tissue of one of the bundle branches: | ||
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*[[#Left_Posterior_Fasicular_Block_.28LPFB.29| Left posterior fascicular block (LPFB)]] | *[[#Left_Posterior_Fasicular_Block_.28LPFB.29| Left posterior fascicular block (LPFB)]] | ||
Sometimes this conduction delay is ''' | Sometimes this conduction delay is '''rate-dependent ''': the bundle branch block occurs only at higher heart rates and disappears at slower heart rates. | ||
{{clr}} | {{clr}} | ||
= LBBB vs RBBB = | |||
[[Image:LBTB_RBTB_en.png|thumb| A bundle branch block causes a delay in the depolarization of the right (RBBB) or left (LBBB) ventricle. In RBBB the QRS complex shows a second peak or R' in V1.]] | [[Image:LBTB_RBTB_en.png|thumb| A bundle branch block causes a delay in the depolarization of the right (RBBB) or left (LBBB) ventricle. In RBBB the QRS complex shows a second peak or R' in V1.]] | ||
Check V1 when QRS > 0.12 sec. | Check V1 when QRS > 0.12 sec. | ||
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{{clr}} | {{clr}} | ||
=Left Bundle Branch Block (LBBB)= | |||
{{:LBBB}} | {{:LBBB}} | ||
{{clr}} | {{clr}} | ||
=Right Bundle Branch Block (RBBB)= | |||
{{:RBBB}} | {{:RBBB}} | ||
=Left Anterior Fascicular Block (LAFB)= | |||
{{Box| | {{Box| | ||
;Criteria for Left Anterior Fascicular Block | ;Criteria for Left Anterior Fascicular Block | ||
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{{clr}} | {{clr}} | ||
=Left Posterior Fasicular Block (LPFB)= | |||
[[File:E0003194.png|thumb|A patient with [[RBBB]] and left posterior Fascicular block]] | |||
{{Box| | {{Box| | ||
;Criteria for posterior fascicular block: | ;Criteria for posterior fascicular block: | ||
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}} | }} | ||
=Mechanisms of aberrant conduction= | |||
[[Image:E000573.jpg|Rate dependant left bundle branch aberration|thumb]] | [[Image:E000573.jpg|Rate dependant left bundle branch aberration|thumb]] | ||
{{box| | {{box| | ||
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{{clr}} | {{clr}} | ||
{{Box| | {{Box| | ||
=References= | |||
<biblio> | <biblio> | ||
#Garcia isbn=0763722464 | #Garcia isbn=0763722464 |