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19 Cards in this Set
- Front
- Back
Einthoven's triangle
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Limb leads definition of the frontal axis
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Algorithm
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Sinus Rhythm? + P wave in II
Rate (btwn 30-100?) QRS Axis (btwn -30-90?) PR, QRS, QT intervals Atrial Enlargement? QRS Morphology - BBB?, MI?, hypertrophy? AV conduction ST Segments |
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Precordial leads
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Leads V1-V6 defining the transverse plane
V1-R PS 4th ICS V2-L PS 4th ICS V3-btwn V2 & V4 V4-L MC 5th ICS V5-L AA 5th ICS V6-L MA 6th ICS |
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PR interval
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Beginning of P wave to beginning of QRS complex. Represents the time required to activate the atria and conduct through the AV node & His-Purkinje network. Normal btwn 0.12-0.2 sec
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QRS complex
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Total duration of ventricular depolarization
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ST segment
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Time measured from the end of the QRS complex to the beginning of the T wave
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P wave
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Represents atrial depolarization. + P wave in II represents sinus rhythm
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QT interval
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Measures cardiac repolarization. normal < 0.4-0.45 sec
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L Axis Deviation
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< -30 degree axis
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R Axis Deviation
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> +90 degree axis
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RA enlargement
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pulm, RV, or TV disease
enlarged P wave in II increased + deflection in V1 |
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LA enlargement
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LV or MV disease
lengthened P wave in II increased - deflection in V1 |
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RV hypertrophy
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V1 R wave > 7mm or R/S > 1
QRS < 0.12 sec R axis deviation V1/2 ST-T abnormalities |
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LV hypertrophy
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V1 S wave + V5/V6 S wave > 35mm
aVL R wave ? 11mm I R wave + III S wave > 25mm |
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RBBB
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V1 rSR'
terminal S wave in I and V6 QRS > 0.12 sec |
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LBBB
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V1 rS or QS
I broad notched R wave aVL & V6 QRS > 0.12 sec ST-T abnormalities in I, aVL, V6 |
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ST-T wave abnormalities
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repolarization abnormalities
RVH, RBBB seen in V1 & V2 LVH, LBBB seen in I, aVL, V5, V6 |
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MI
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Transmural - increased T wave amp followed by ST elevation, R wave diminished, Q wave exaggeration, T wave inversion, ST back to baseline
Subendocardial - ST depression, T wave inversion nonSTEMI |
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Hyperacute T wave
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1st sign of an MI
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