Abstract
Analytical studies of spatial vectorcardiogram were performed with a spatial cardiograph of an improved type. In normal persons, the average length, deviation and depression of the maximum vector in QRS trace were 1.95mV, 146° and 40°, respectively; and those of T wave were 0.7mV, 60° and 30°, respectively. The trace demonstrated counterclockwise rotation in all cases.
Quadrant reading was found effective for the diagnosis of heart diseases and the localization of the lesions. In quadrant vectorcardiogram, introduced and so named by us, the characteristics of a spatial vector loop were converted into a numerical expression, thus conveying a clear stereographical notion. Automatic analysis by the use of an electronic computer could symbolically express a spatial vectorcardiogram and was found to be a promising and effective method of reading vectoreardiogram.
