Abstract
The authors have constructed an apparatus with three vibrators and a halfmirror which indicates a spatial vector as a light spot in three-dimensional space. A new type of spatial vectorcardiograph was produced by attaching a vectorcardiograph to this apparatus. The lead system of Frank and a new coordinate system of the authors were employed, and the observation of the cardiac vector was performed. The cardiac vector was visualized as a locus of the light spot which forms three-dimensional loops in space. The observation and the analysis of the heart vector with determination of the quadrants of the loops were performed in normal individuals and in some clinical cases. It was possible to record the spatial vectorcardiogram by the usual photography or stereophotography and to perform objective analysis. This method may be of some value for clinical and educational purposes.
