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34 Cards in this Set
- Front
- Back
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Where is sodium located? inside or outside cell
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outside
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electrostim increase or decrease Na+ permeability?
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increase
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Na+ is fast or slow channel?
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fast
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Potassium located inside or outside of cell?
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inside
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K+ fast or slow channel?
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slow
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Repolarization occurs through?
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K+ flow back into cell, exceeding Na+
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10 electrodes allow how many different, simultaneous views of the heart's contraction?
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12
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describe Einthoven's triangle:
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(-) (-) lead 1 (+) (-)
lead 2 lead 3 (+) (+) (left leg lead) |
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wave of depolarization goes in which direction?
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down and to the left
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what is that crazy poem about lead placement?
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"the white clouds over the green grass, the black smoek over the red fire, all goes around the brown"
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V1 hears what?
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tricuspid valve
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V2 hears wat?
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tricuspid valve
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V4 hears what?
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mitral valve
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Which leads look at lateral wall?
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1, AVL, V5 V6
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which leads look at anterior wall?
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V1 V2
V3 V4 |
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Which leads look at inferior wall?
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Lead II, III
AVF |
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Which lead looks at no specific view?
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AVR
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Left anterior descending artery supplies
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anterior wall
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Right coronary artery supplies
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inferior wall
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Circumflex artery supplies
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lateral wall
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To determine an MI via 12 lead EKG you need
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Q wave >1/3 the R wave
and/or Q wave >1 small box wide (>.04s) in at least 2 of the leads corresponding to wall in question |
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P wave corresponds with
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atrial contraction
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PR interval represents
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start of atrial contraction to start of ventircular contraction
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QRS complex represents
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ventricular contraction
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T wave represents
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ventricular repoarization
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in EKG chart, 1 small box =?
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.04 second
5 small box in 1 large box = .20 seconds |
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U wave represents
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late repolarization of ventricles/bundle branches
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ST segment and T wave define
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entire ventricular repolarization method
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R wave
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1st positive deflection following P wave is called
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Q wave
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`negative deflection that follows P wave but precedes R wave is called
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S wave is
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negative wave following R wave
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Explain EKG rate countdown
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Find R wave on bold line
count down number of large boxes until next R wave |
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Explain EKG rate HR ruler
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place reference marker at start of p wave qrs complex
and count 2 or 3 cycles to get rate |
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Explain EKG rate 6 second count method
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Locate 3 second marker at top of strip,
count # of complete complexes over 6 seconds multiply by 10 |
