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Wilson leads (normally V1-V6) are so called unipolar leads: that means that 3 extremities' electrodes are put together over a high resistance to a so called "indifferent" electrode, against which you can record electrical activity to pretty much any point of the body. So, as you correctly stated, you need 3 extremities' leads RA, LA, LF (+ ground RF of ...
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The mechanism is depicted in the diagram you posted, most obvious in "A":
ECG (and any voltage measurement) is based on a potential difference
You don't measure the voltage at one spot, you measure the difference between two spots. Those spots are depicted in the diagram with a (-) and (+) symbol, although the (-) is left out of BCD.
In A and D, the ...
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This question violates rules; the only reason I'm answering is because it is normal.
It's got a regular rhythm with a normal rate, an axis around 30º, which is normal.
All segment durations are within normal limits, and I don't see any conduction blocks. The "Possible infarction" comment is an automated interpretation by the machine (more often than not, ...
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