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25 Cards in this Set
- Front
- Back
what do the limb leads use as ground?
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the other two leads (for aVF, uses aVL and aVR as grounds)
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inferior leads are ___, ___, and ___. they reflect ________.
lateral leads are ___ and ___. these refect ________. |
aVF, II, III; inferior LV wall pathology (such as ischemia or infarction)
I, aVL; lateral LV wall pathology |
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all standard ekg leads have positive QRS except ____.
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aVR (because it points in the opposite direction of mean vector of depolarization)
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V1, V2 reflect ____.
V3, V4 reflect ____. V5, V6 reflect ____. |
septal (or anteroseptal) leads
anterior leads lateral leads |
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explain the normal R wave progression from V1 to V6.
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This transition from negative to isoelectric to postive is normal progression. V1 is going in opposite direction of the heart and the leads become upright as they align with the orientation of the heart.
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ST segment elevation = _____
ST depression = _____ |
acute injury
ischemia |
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In a normal P-QRS-T sequence,
P= QRS= T= |
atrial depolarization
ventricular depolarization ventricular repolarization |
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Put these in order of depolarization:
Purkinje fibers, His, SAN, bundle branches, AVN |
SAN, AVN, His, bundle branche, purkinje fibers
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study this picture for a bit and run through the correct pathway of depolarization... =) and then you can think of aya...
also, how would a left atrial enlargement show up on a ekg? |
rmember that if left atrium were enlarged, it would take longer time to depolarize and p-wave would be bigger
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ST segment elevation = _____
ST depression = _____ |
acute injury
ischemia |
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In a normal P-QRS-T sequence,
P= QRS= T= |
atrial depolarization
ventricular depolarization ventricular repolarization |
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Put these in order of depolarization:
Purkinje fibers, His, SAN, bundle branches, AVN |
SAN, AVN, His, bundle branche, purkinje fibers
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blockage of AV node or His bundle would show up on the ekg where?
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PR interval
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what could give you prolonged QRS interval? (3)
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-blockage of bundle branches
-blockage at purkinje fiber level -myocardium (ie. LV eccentric hypertrophy) |
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what would ectopic atrial rhythm show up on ekg as?
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abnormal p-wave
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what 2 things could a wide QRS interval be?
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bundle branch block (BBB)
OR dilated ventricles! |
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localize on ekg:
AV block= accessory tract = |
long PR interval
short PR interval |
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blockage of AV node or His bundle would show up on the ekg where?
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PR interval
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what could give you prolonged QRS interval? (3)
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-blockage of bundle branches
-blockage at purkinje fiber level -myocardium (ie. LV eccentric hypertrophy) |
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what would ectopic atrial rhythm show up on ekg as?
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abnormal p-wave
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what 2 things could a wide QRS interval be?
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bundle branch block (BBB)
OR dilated ventricles! |
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localize on ekg:
AV block= accessory tract = |
long PR interval
short PR interval |
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left or right axis deviation?
lead 1 positive aVF neg |
left axis deviation
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left or right axis deviation?
lead 1 negative aVF neg |
neither; extreme axis deviation (indeterminate)
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left or right axis deviation?
lead 1 negative aVF pos |
right axis deviation
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