A graphic representation of the instant-to-instant magnitude and direction of the heart's action currents in the form of vector loops.
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vec·tor·car·dio·gram .vek-tər-'kärd-ē-ə-.gram n a graphic record made by vectorcardiography
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(VCG) vec·tor·car·dio·gram (VCG) (vek″tər-kahrґde-o-gram″) the record, usually a photograph, of the loop formed on the oscilloscope in vectorcardiography, the inscribed loop representing the ends of the instantaneous vectors.Medical dictionary. 2011.