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lead one lateral
3 is below
four ants, four front
Leads I, II, III are ____ limb leads
Leads aVR, aVL, aVF are _______ limb leads
Horizontal plane: leads viewed fromhorizontal plane are precordial, or V leads
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)
other 3 limb leads and precordial or chest leads are unipolar. Only one pos electrode
Normal p-r interval
0.12-0.20, or between 3-5 small boxes
normal qrs complex
0.06-0.12 sec, or less than 3 small boxes
up to how many impulses per min?
impulse init card depol comes from somewhere above the ventricle, in the atria not SA node.
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.