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Intraventricular Conduction: Difference between revisions
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{{Box| | {{Box| | ||
;Criteria for left anterior fascicular block | ;Criteria for left anterior fascicular block | ||
: | :Left axis deviation (<-30°) | ||
: | :No or very small S in lead I | ||
: | :Normal small q in lead I | ||
:S > R in leads II and III | :S > R in leads II and III | ||
: | :No or very few QRS widening | ||
}} | }} | ||
[[Image:LAHB.png|thumb|Left anterior hemiblock]] | [[Image:LAHB.png|thumb|Left anterior hemiblock]] | ||
| Line 65: | Line 65: | ||
#A slow heart rate (phase 4 aberration) | #A slow heart rate (phase 4 aberration) | ||
Right bundle branch block is | Right bundle branch block is more common, because the right bundle has the longer refractory period. Left bundle branch block accounts for about 1/3rd of cases. | ||
===Phase 3 Aberration=== | ===Phase 3 Aberration=== | ||