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NCI: A ventricular tachycardia in which the ventricular activation sequence is variable. The morphology of the electrocardiographic waveform is variable and is referred to as polymorphic.,NCI: A ventricular tachycardia in which the ventricular activation sequence is variable. The morphology of the electrocardiographic waveform is variable and is referred to as polymorphic. (NCI)
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