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17 Cards in this Set
- Front
- Back
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what causes the PR interval to be short in WPW?
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the Bundle of Kent, an accessory pathway, short circuits the AV node
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what will the PR interval be like in WPW?
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shortened (<.12seconds)
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what will the bundle of kent do to septal depolarization?
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cause it to occur from right to left
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does WPW have any effect on QRS?
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yes!
QRS>,10seconds aka widened due to the early depolarization of the septum |
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in WPW what is the characteristic low slope of the initial Q wave known as?
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Delta Wave
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What are the 3 classic findings in WPW
(on HEART ruler) |
1. QRS>.10sec
2. PR<.12sec 3. presence of delta waves |
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if you see a short PR interval on the ECG what should you start thinking?
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WPW
but you still need to find the other 2 criteria...which were? QRS>.1s delta waves |
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please draw the electrical axis, labeling Quadrants, and relative axis
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if your electrical axis is normal, what does this mean about leads I and aVF?
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that they are both dominantly positive
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you are looking at an ECG. Like a good student you look at leads I and aVF. You notice that lead I is dominantly positive and aVF is dominantly negative. What does this mean?
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that the electrical axis is ABNORMAL
both should be positive this means you have a left axis deviation QIV |
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if lead I is negative and aVF is positive what does this mean for your electrical axis?
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right axis deviation
QII |
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if lead I is negative and aVF is negative what does this mean for your electrical axis?
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severe rt axis deviation
QIII |
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what are the 2 divisions of the left bundle branch?
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Anterior-Superior
Posterior-Inferior note you can get LAFB (left anterior fasciuclar blocks) or LPFB |
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what is the most common fascicular block?
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LAFB
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what must the axis be if you have a LAFB?
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Axis < or equal to -30
left axis deviation |
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What are the 3 criteria of LAFB?
(on HEART ruler) but should still really know this one!!! |
Axis < or equal to -30 (or just Lead II is dominantly negative)
Small Q wave in leads I, aVL small R wave in leads II, III, aVF |
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what is meant by bifascicular block?
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RBBB + LAFB
(note that is the most common, it can technically be any 2 blocks) |
