ECG Tele

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Lead I

Lateral Surface

lead one lateral
Lead III

Inferior Surface

3 is below
Lead VI

Septal area

6 septal
Lead 4

Anterior

four ants, four front
Bipolar leads

I, II, III
Leads I, II, III are ____ limb leads

standard
Leads aVR, aVL, aVF are _______ limb leads

augmented
V 1-6

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)
Unipolar leads

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
qt interval

0.36-0.44 sec
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
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.