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38 Cards in this Set

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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
How do you diagnose an LAHB?
Finding a Q in I and a wide or deep S in III (Q1, S3).
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.
Why is Pure Posterior Hemiblock (LPHB) rare?
b/c of the dual blood supply
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.
How can you tell that there is a posterior block?
Look for deep unusually wide S in lead I and Q in lead III (S1, Q3).
PRI >0.20 but consistent.
1 Degree AVB
PRI >0.20 and getting longer until it drops a QRS.
2 Degree Type I (Wenckebach)
QRS <0.12 with no PRI
3 Degree Complete Heart Block
QRS <0.10 with atrial rate twice ventricular rate
2 Degree Type II AVB
QRS >0.12 with atrial rate twice ventricular rate
3 Degree Complete Heart Block
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
How do you diagnose an LAHB?
Finding a Q in I and a wide or deep S in III (Q1, S3).
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.
Why is Pure Posterior Hemiblock (LPHB) rare?
b/c of the dual blood supply
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.
How can you tell that there is a posterior block?
Look for deep unusually wide S in lead I and Q in lead III (S1, Q3).
PRI >0.20 but consistent.
1 Degree AVB
PRI >0.20 and getting longer until it drops a QRS.
2 Degree Type I (Wenckebach)
QRS <0.12 with no PRI
3 Degree Complete Heart Block
QRS <0.10 with atrial rate twice ventricular rate
2 Degree Type II AVB
QRS >0.12 with atrial rate twice ventricular rate
3 Degree Complete Heart Block
SSS
Group of dysrhythmias that share alternating fast and slow rhythms SB, ST, Sinus Block, and failure of escape pacemakers)
Abrupt sinus arrest associated with loss of consciousness usually describes what dysrhythmia?
SSS
Brady-Tachy Syndrome
Intermittent episodes of SVT, A-Fib, or A-flutter, with sinus brady seen in pts with SSS
What is a cause of Brady-Tachy Syndrome?
Hypersensitive Carotid Sinus - shaving or wearing a necktie too tight around Carotid Sinus area.
This is said to be the "Wastebasket" of dysrhythmias.
SSS
What causes SSS?
SA node dysfunction associated with unresponsive supraventricular automaticity foci.
Ectopy/Ectopic Rhythms
Abnormal rhythms that arise from elsewhere other thanthe sinus node.
What are the two ways that ectopic beats can arise on the cellular level?
-Enhanced Automaticity (other pacemakers take over - disorder in impulse formation)
-Reentry (disorder in impulse transmission)