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Intraventricular Conduction

80 bytes added, 15:11, 2 June 2009
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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:
*[[#Left_Bundle_Branch_Block_.28LBBB.29| Left Bundle Branch Block (LBBB))]]
*[[#RBBBRight_Bundle_Branch_Block_.28RBBB.29| Right Bundle Branch Block(RBBB)]]
*Interventricular conduction delay
A right or left axis rotation can be caused by a:
*[[#Criteria for LAFBLeft_Anterior_Fascicular_Block_.28LAFB.29| left anterior fascicular block (LAFB)]]*[[#Criteria for LPFBLeft_Posterior_Fasicular_Block_.28LPFB.29| left posterior fascicular block (LPFB)]]
Sometimes this conduction delay is '''frequency-dependent ''': the bundle branch block occurs only at higher heart rates and disappears at slower heart rates.
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