title: Contribution to the vector analysis of the orthogonal electrocardiogram.
abstract: A method is described for characterizing the spatial directions of vectors with the aid of the angle alpha, characterizing the direction of the vector's projection upon the frontal plane, and angle beta, indicating the deflection of the spatial vector from the frontal plane. Angle alpha is expressed in the mode used with the conventional ECG system [from 0 degrees to +/- 180 degrees], and angle beta from 0 degrees to +/- 90 degrees. Calculations are made with the aid of algebraic formulae, and the results are tabulated. To facilitate the calculations of the magnitudes and directions of vectors in the space with respect to the orthogonal leads, and for better illustration, special schemes are presented.
mesh_terms: D004562:Electrocardiography / Q000379:methods*; D006801:Humans; D008433:Mathematics; D014672:Vectorcardiography / Q000379:methods