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38 Cards in this Set
- Front
- Back
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What parts of the bundle branches are fed by the RCA?
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Posterior fascicle of the Bundle Branch.
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Which fascicle has dual blood suppply?
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Posterior Fascicle
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What will an occlusion of the LAD cause (in terms of blocks)?
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RBBB and a Left Anterior Hemiblock (LAHB).
Remember: The posterior fascicle is spared b/c of the dual blood supply!!!! |
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How many seconds is the QRS in a pure LAHB?
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0.10-0.12 seconds
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How do you diagnose an LAHB?
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Finding a Q in I and a wide or deep S in III (Q1, S3).
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In an LAHB, a slight delay in the conduction of the anterolateral and superior area of the left ventricle will cause what?
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Unopposed and late depolarization upward and leftward recognized as LAD.
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Why is Pure Posterior Hemiblock (LPHB) rare?
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b/c of the dual blood supply
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What can impair blood supply to the posterior fascicle?
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inferior wall infarction
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How does LPHB cause RAD?
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Because of the late and unopposed depolarization force towards the right.
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How can you tell that there is a posterior block?
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Look for deep unusually wide S in lead I and Q in lead III (S1, Q3).
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PRI >0.20 but consistent.
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1 Degree AVB
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PRI >0.20 and getting longer until it drops a QRS.
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2 Degree Type I (Wenckebach)
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QRS <0.12 with no PRI
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3 Degree Complete Heart Block
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QRS <0.10 with atrial rate twice ventricular rate
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2 Degree Type II AVB
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QRS >0.12 with atrial rate twice ventricular rate
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3 Degree Complete Heart Block
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What parts of the bundle branches are fed by the RCA?
|
Posterior fascicle of the Bundle Branch.
|
|
|
Which fascicle has dual blood suppply?
|
Posterior Fascicle
|
|
|
What will an occlusion of the LAD cause (in terms of blocks)?
|
RBBB and a Left Anterior Hemiblock (LAHB).
Remember: The posterior fascicle is spared b/c of the dual blood supply!!!! |
|
|
How many seconds is the QRS in a pure LAHB?
|
0.10-0.12 seconds
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|
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How do you diagnose an LAHB?
|
Finding a Q in I and a wide or deep S in III (Q1, S3).
|
|
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In an LAHB, a slight delay in the conduction of the anterolateral and superior area of the left ventricle will cause what?
|
Unopposed and late depolarization upward and leftward recognized as LAD.
|
|
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Why is Pure Posterior Hemiblock (LPHB) rare?
|
b/c of the dual blood supply
|
|
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What can impair blood supply to the posterior fascicle?
|
inferior wall infarction
|
|
|
How does LPHB cause RAD?
|
Because of the late and unopposed depolarization force towards the right.
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|
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How can you tell that there is a posterior block?
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Look for deep unusually wide S in lead I and Q in lead III (S1, Q3).
|
|
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PRI >0.20 but consistent.
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1 Degree AVB
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PRI >0.20 and getting longer until it drops a QRS.
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2 Degree Type I (Wenckebach)
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QRS <0.12 with no PRI
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3 Degree Complete Heart Block
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QRS <0.10 with atrial rate twice ventricular rate
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2 Degree Type II AVB
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QRS >0.12 with atrial rate twice ventricular rate
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3 Degree Complete Heart Block
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SSS
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Group of dysrhythmias that share alternating fast and slow rhythms SB, ST, Sinus Block, and failure of escape pacemakers)
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Abrupt sinus arrest associated with loss of consciousness usually describes what dysrhythmia?
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SSS
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Brady-Tachy Syndrome
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Intermittent episodes of SVT, A-Fib, or A-flutter, with sinus brady seen in pts with SSS
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What is a cause of Brady-Tachy Syndrome?
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Hypersensitive Carotid Sinus - shaving or wearing a necktie too tight around Carotid Sinus area.
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This is said to be the "Wastebasket" of dysrhythmias.
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SSS
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What causes SSS?
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SA node dysfunction associated with unresponsive supraventricular automaticity foci.
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Ectopy/Ectopic Rhythms
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Abnormal rhythms that arise from elsewhere other thanthe sinus node.
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What are the two ways that ectopic beats can arise on the cellular level?
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-Enhanced Automaticity (other pacemakers take over - disorder in impulse formation)
-Reentry (disorder in impulse transmission) |
