Key result
Mechanically derived vector loops show no difference in key characteristics versus electronically integrated loops.
Why the study?
A method to measure important time intervals from scalar leads and integrate them into vector loops mechanically was needed to improve vectorcardiographic analysis.
A mechanical drawing board based on a pulley system can integrate scalar leads into vector loops with characteristics similar to electronically integrated loops.
Mechanical integration yields comparable vector loops; leaves open clinical utility and requires prospective validation before adoption.
A modification of the vectorcardiographic method of studying electrical events is presented. Simultaneous scalar leads, taken by any vector lead system, are first recorded. The important time intervals, difficult or impossible to read from the loop itself, are measured from these tracings. Proper pairs of the scalar leads can then be rapidly integrated into vector loops by an easily constructed drawing board based on the pulley system. This instrument is described in detail. It is demonstrated that loops so derived do not appear to differ in their important characteristics from electronically integrated loops.
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Witham et al. (1954) studied this question. Mechanical inscription using a pulley-based drawing board vs. Electronically integrated loops was evaluated on Characteristics of vector loops. Vector loops derived mechanically using a pulley-based drawing board do not appear to differ in their important characteristics from electronically integrated loops.
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