| abstract |
A computationally efficient two channel scatter diagram analysis algorithm for distinguishing monomorphic ventricular tachycardia (VT) from polymorphic ventricular tachycardia and ventricular fibrillation (VF). Scatter diagram analysis plots the amplitude from one channel (morphology) versus the amplitude from another channel (rate) on a graph with a fifteen-by-fifteen grid. A fraction or percentage of the 225 grid blocks occupied by at least one sample point is then determined. Monomorphic VT traces nearly the same path in space and occupies a smaller percentage of the graph than a non-regular rhythm such as polymorphic VT or VF. |