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Lead I
Lateral Surface
lead one lateral
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Lead III
Inferior Surface
3 is below
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Lead VI
Septal area
6 septal
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Lead 4
Anterior
four ants, four front
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Leads I, II, III are ____ limb leads
standard
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Leads aVR, aVL, aVF are _______ limb leads
augmented
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V 1-6
Horizontal plane: leads viewed fromhorizontal plane are precordial, or V leads
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Bipolar leads- flow between 2 electrodes, one neg and one pos. View is FROM neg electrode to pos electrode. Standards leads: __,__,__ are all Bipolar
- 1- from rt shoulder (neg) to left (pos)
- II- from rt shoulder (neg) to left leg (pos)
- III- from left shoulder (neg) to left leg (pos)
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Unipolar leads
other 3 limb leads and precordial or chest leads are unipolar. Only one pos electrode
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Normal p-r interval
0.12-0.20, or between 3-5 small boxes
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normal qrs complex
0.06-0.12 sec, or less than 3 small boxes
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qt interval
0.36-0.44 sec
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supraventricular
up to how many impulses per min?
impulse init card depol comes from somewhere above the ventricle, in the atria not SA node.
400
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role of AV node in atrial dysrhythmias
are qrs complexes normal?
protective barrier, blocks impulses from conduction to ventricle. causes v rhythm to be irreg in many pts with atrial dysrhythmias
once through AV node, conduction is normal, so qrs usually looks normal too.
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