umls-concept:C0344432 | skos:definition | 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) | lld:umls |