**Ventricular gradient** represents the difference in duration, speed and direction of electromotive force during depolarization and repolarization ventricular displayed as a vector, the resulting process of depolarization (AQRS) and repolarization (at) ventricles.

The value of the electromotive force during depolarization and repolarization of the ventricles are the same. If the infarction was homogeneous mass and duration, speed and direction of the process of depolarization and repolarization would be the same, with the same voltage electromotive force produced by these processes, and its opposite direction average electrical axis of the micro and the T wave would be the same, but pointing in opposite directions. The algebraic sum of the squares of the micro and the T wave this would equal zero and ventricular gradient was absent. But the duration, speed, and direction in physiological conditions of processes of depolarization and repolarization of the ventricles is not the same, the QRS complex and the T wave is not directed in opposite directions. This poses ventricular gradient (G).

To determine the magnitude (in millivolts-seconds) and direction (angle) ventricular gradient set, using six-axis coordinate system, the average of the electrical axis of the QRS complex (AQRS) and the T wave (at). Got minor axis AQRS and at, by rule of the parallelogram of forces to produce a third of the resulting value - ventricular gradient representing the diagonal of a parallelogram. In norm the absolute value of G varies in men 45 to 50 MB/s, women - about 47 MB/sec. The angle and G on the average for men is equal to 45 and women - about 35 degrees.