Spatial Vectorcardiography

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Abstract
Myocardial InfarctionThe vectors of depolarization point from endocardium to epicardium in reference systems having a positive polarity, and in the reverse direction if the polarity is negative. The discussion in this and the following sections refers to systems of positive polarity, as used in this laboratory, but is applicable to the opposite polarity by a reversal of the direction of the vectors.Each point on the QRS loop is the terminus of a resultant of numerous component vectors, contributed by all muscle elements undergoing depolarization at that instant. Infarction of some of these elements renders them electrically inert, and . . .