In other words, instead of terminating it, the pacing actually perpetuated and worsened the initial condition in about 20 percent of the cases. That percentage approximates the frequency with which this is thought to occur in patients with implanted defibrillators.

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In the beginning, there is a single rotating wave -- the 'culture dish' analog of ventricular tachycardia. After a short period, we applied trains of pulses in an attempt to terminate this wave.

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