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. 2018 Apr 5;7(8):e008160. doi: 10.1161/JAHA.117.008160

Figure 1.

Figure 1

Measurement of GEH. A, Spatial QRS‐T angle represents the angle between the QRS‐vector and T‐vector in three‐dimensional space. B, Spatial ventricular gradient (SVG) is a vector defined as the vector sum of the QRS‐vector and the T‐vector. SVG magnitude is the length of the SVG‐vector. SVG azimuth is the angle of the SVG‐vector projected onto the XY (horizontal) plane, and SVG elevation is the angle of the SVG‐vector projected in the XZ (vertical) plane. C, SAI QRST represents the sum of the area under the QRS complex and T‐wave using the isoelectric line as the reference (shaded area). X‐, Y‐, and Z‐lead QRS‐T complexes and their calculated SAI QRST results are shown.