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Figure 3. Twelve-lead ECG tracing during stress test shows the typical aspect of bidirectional ventricular tachycardia characterized by 180° alternating QRS axis on a beat-to-beat basis, with a right ...

The rate of these tachycardias usually exceeds 70 bpm. Figure 4 illustrates an example of nonparoxysmal junctional tachycardia. Note the gradual onset of the junctional mechanism as the sinus ...

Ventricular tachycardia is an abnormally fast heart beat (with three or more consecutive heart beats at least 100 beats per minute) that originates from one of the ventricles in the heart.