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26 Cards in this Set
- Front
- Back
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Where are surface electrodes placed to form Einthoven's triangle?
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Lead right arm, left arm, left leg
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What does lead I record?
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Potential differences between right arm to left arm
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What does lead II record?
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potential differences between right arm to left leg
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What does lead III record?
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Potential differences between left arm to left leg
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How do you construct the central terminus (Wilson's central terminal, aka V) for use in augmented unipolar limb leads?
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Use one of limb as the positive pole and the other two, collectively, as the negative pole.
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What does lead aVR record?
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Potential differences between the V and the right arm
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What does lead aVL record?
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Potential differences between the V and the left arm
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What does lead aVF record?
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Potential differences between the V and the left leg
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List the five events in order of cardiac depolarization and repolarization.
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Impulse origination/atrial depolarization, septal depolarization, apical/early ventricular depolarization, late depolarization, and repolarization
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What generates the p wave in lead I recording?
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Impulse origination/atrial depolarization
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What generates the negative q wave in a lead I recording?
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septal depolarization
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What generates the R part of the QRS complex in a lead I recording?
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apical/early ventricular depolarization
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What generates the S part of the QRS complex in a lead I recording?
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Late ventricular depolarization
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What generates the T part in a lead I recording.
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repolarization
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What causes the directions (positive or negative) in a bipolar lead system?
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If the electical vector axis is following the bipolar lead vector, the defelction will be positive and vice versa
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List the markings for determining heartrate using an EKG (using the big boxes).
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300, 150, 100, 75, 60, 50
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What does 1 mm (one little box) correspond to for voltage?
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0.1 mV
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For timing what does one little box indicate?
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0.04 secs
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For timing what does one bix box (five little boxes) indicate?
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0.2 secs
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What is the brief isoelectric period following the QRS complex called and what causes it?
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ST segment; caused when all regions of the myocardium are in a plateau (depolarized)
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How is the mean QRS vector determined?
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Summation of all of the instantaneous vecotrs generated at all times and in all regions of the ventricles during depolarization.
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Of the six leads, which should have upright P waves?
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Leads I, II and aVF
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What is the range for a normal mean QRS axis?
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-30 to 90 degs
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What is the EZ method to deremine if the mean QRS axis is left axis deviant?
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I (+) and II (-)
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What is the EZ method to determine if the mean QRS axis is right axis deviant?
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I (-) and II (+)
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What is standard paper speed and height/mV?
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25 mm/s and 10mm/mV
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