Blocks Devin Herbert, R3 Aug 23, 2012
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Transcript of Blocks Devin Herbert, R3 Aug 23, 2012
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BlocksDevin Herbert, R3
Aug 23, 2012
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AV nodal blocks1st degree: PR >200msec
2nd degree: Type I (Wenckebach) vs. Type II
3rd degree: complete heart block
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Bundle Branch BlocksRight BBB: QRS >120msec
RSRI in V1
Slurred S in V6
Left BBB: QRS >120msec
monomorphic S in V1
monomorphic R in V6
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HemiblocksLAFB: LAD (-30 to -90o)
R wave in V1
rS in III (usually II and aVF also)
LPFB: RAD (90 to 180o)
Exclusion of RVH
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Extreme right Left axis
Right axis Normal
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Bifascicular blockRBBB + LAFB or LPFB
Trifascicular block1st degree AV block + bifascicular block
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Practice
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Sinus bradycardia
1st degree AV block
RBBB
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Sinus
2nd degree AV block, 2:1 conduction (likely Type II)
RBBB
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Sinus bradycardia
RBBB
LAFB
= Bifascicular block
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Sinus
2nd degree AV block, Type II
RBBB
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Complete heart block
Ventricular escape
RBBB
LAFB
= Bifascicular block
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AV dissociation
LBBB
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Sinus bradycardia
2nd degree AV block, 2:1 conduction
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A Fib
RBBB
LAFB
= Bifascicular block
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Junctional escape
Complete heart block
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Sinus
1st degree AV block
RBBB
LAFB
= Trifascicular block
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Sinus tachycardia
2nd degree AV block, Type I
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The end
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Sinus
2nd degree AV block, 2:1 conduction
RBBB