EKG
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Cellular electrophysiologists measure potentials by | measuring the inside of the cell with respect to the outside of the cell
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| Electrocardiographers depend on | Surface electrodes
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| Measurements are recorded as the ________ between two electodes | Potential difference
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| When the depolarizing wave approaches the positive electrode, the deflection is _______ | upward
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| Fully Depolarized | All positive inside
all negative outside
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| Repolarization occurs in the _________ direction | opposite
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| The last to depolarize is the __________ to repolarize. | first
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| Sequence of electrical activation and teh ECG | Endo -> Epi -> Apex -> Base
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| Q wave | depolariztion of the sepum
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| P wave | depolarization of the atria
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| S | Late lateral depolarization of the left base
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| ST segment | Full depolarization
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| T | repolarization
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| U | Late repolariztion of mid cells in myocardium
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| QRS | Ventrical depolarization
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| PR segment | time between atrial activation and ventricular activation
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| If conduction is slowed through the AV node, what happens to the PR interval? | Lengthens
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| Bundle Branch Block | Wide QRS
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| cardiac ion channelopathies that can lead to long _____________ | QT intervals
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| Lead I | + left arm
- right arm
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| Lead II | + Left Leg
- Right arm
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| Lead III | + left leg
- left arm
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| aVF | + left foot
- Head
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| aVR | + right arm
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| aVL | + left arm
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| Downward deflection of QRS normal in lead | aVR
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| Horizontal plane | V1-V6
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| Interpretation of ECG | rate
rhythm
vector in frontal plane
hypertorphy
infarction
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| Rate = | (60s/min) / R-R interval
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| Large box = | .2 seconds
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| 1 Large box | 300 bpm
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| 2 large box | 150 bpm
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| 3 large box | 100 bpm
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| 4 large box | 75 bpm
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| 5 large box | 60 bpm
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| 6 large box | 50 bpm
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| LAD | I = upward
aVF = Downward
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| Normal axis | I = upward
aVF = upward
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| RAD | I = downward
aVF = upward
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| Extreme RAD/LAD | I = downward
aVF = downward
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| I | 0 degrees
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| II | 60 degrees
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| III | -60 degrees
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| avF | 90 degrees
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| avL | -30 degrees
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| avR | -150 degrees
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| Quick and easy devation method | 1. find isoelectric line
2. find vector that is perpendicular....is it up or down?
3. up is positive vector down is negative vector
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| Hypertrophy vector movement | vector moves toward hypertrophy
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| infaction vector movement | vector moves away infarction
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Created by:
tjamrose
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