Different things: A short pr interval means that the heart beat is either initiated in a part of the atrium which is distinct from the sinus node (where it usually starts) or is being conducted with accelerated velocity to the ventricles. The other changes are "non-specific" and can be due to anything, like sodium, potassium or magnesium levels, medicines, lead position, skeletal variation and many other things.
Answered 11/5/2019
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