Coding the vectocardiogram as a sequence of objects vectocardiogram is a spatial record of electrical field from active heart, in the diagnostic aspect important are only the loops drawn by the vector's end during each of the three main episodes of heartbeat similarly to the conventional electrocardiogram, the differences between the consecutive heartbeats are very subtle, thanks to the spatial representation the extracardiac deviations may be suppressed by the geometric transformations three sequences of loops are then very efficiently coded with use of bi-directional prediction-correction method followed by the cosine transform and the Huffman coding. [32],[33],[34],[53]