Bundle-Branch Block & Chamber Enlargement
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| What does intraventricular mean? | Within the ventricle
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| The left main bundle branch of the heart is divided into what? | Two fascicles, and anterior fascicle and a posterior fascicle
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| How does normal depolarisation occur in the right bundle branch and left bundle branch? | Electrical impulses travel through the right bundle branch and left bundle branch and fascicles at the same time causing simultaneous depolarization of the right and left ventricles
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| What is a normal QRS duration? | .10 seconds or less
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| What happens to an electrical impulse when one bundle branch is blocked? | The electrical impulse travel down the intact bundle depolarizing that ventricle first and then the impulse progresses through the interventricular septum to depolarize the other ventricle
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| What is depolarization of one truck ventricle before the other called? | Sequential depolarization
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| What is a result of sequential depolarization? | Depolarization of the ventricles is delayed, resulting in a wide QRS complex of .12 second or greater
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| Which bundle branch block is most common? | Right bundle branch block or RBBB
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| What population is left bundle branch block most commonly seen in? | Elderly individuals with diseased hearts
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| What is the most common cause of left bundle branch block? | Hypertensive heart disease
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| What treatment is indicated for bundle branch block? | Specific treatment is usually not indicated for bundle branch block
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| What does knocking in the QRS signify? | BBB bundle branch block
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| How do you determine if BBB is LBBB or RBBB? | Look at v1 through v6 to make a determination
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| List five criteria for complete LBBB | Wide QRS; notched R waves in V4 V5 V6; wide slurred S in v1 v2 v3; secondary ST/T wave changes, could get left axis deviation
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| Five criteria for Right Bundle Branch Block |
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| Which leads are the right precordial leads? | V1, v2, v3
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| Which leads are the left precordial leads? | V 4, v5, v6, v7
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