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29 Cards in this Set
- Front
- Back
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Normal P-R interval
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.12-.16 seconds
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P wave signifies ...
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atria depolarization
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QRS wave signifies ...
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ventricle depolarization
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T wave signifies ...
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ventricle repolarization
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Why is there no wave for atrial repolarization on an EKG?
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It is overshadowed by the QRS peaks
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Ventricular action potential lasts how long?
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.25-.35 seconds
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When the ventricles are completely polarized, what do we see on the EKG?
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no peak, the peaks are caused by the net movement of ions
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When the ventricles are completely depolarized, what do we see on the EKG?
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Flat line between QRS and T, the peaks are caused by the net movement of ions
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Each small box on an EKG is how much time?
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0.04 seconds
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Each big box on an EKG is how much time?
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.2 seconds
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The Q-T interval is normally ...
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.35 seconds
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The base of the heart is what charge?
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-
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The apex of the heart is what charge?
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+
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The net charge vector of the heart is directed where?
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towards the apex of the heart
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While taking limb leads, charges are administered to the body at what node?
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negative
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While taking limb leads, charges are read at what node?
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positive
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While taking limb leads, current flows from what node to what node?
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negative to positive
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Where is the negative electrode on bipolar lead 1?
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right arm
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Where is the positive electrode on bipolar lead 2?
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left leg
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Where is the negative electrode on bipolar lead 3?
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left arm
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Mathematically, what is Einthoven's Law?
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With bipolar leads, Lead 1+ Lead 3 = Lead 2
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Why is bipolar Lead 2 the strongest of the bipolar limb leads?
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It flows from the base to the apex, exactly with the current of the heart
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Which chest leads should show a negative EKG?
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1 and 2 are at the base of the heart
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Which chest lead shows the strongest peak?
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4 is closest to the apex of the heart
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Where are the 2 negative electrodes in the aVr lead?
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left arm, left leg
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Where are the 2 negative electrodes in the aVf lead?
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left, right arms
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Which augmented unipolar limb lead (aVr, aVl, aVf) is inverted?
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aVr is inverted since both vectors are going against the hearts charges
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When taking chest leads, what is sending the impulse at the negative electrode?
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The heart
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When taking chest leads, which electrode (- or +) is placed on the heart?
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positive
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