Patent ID: 8229552
Filing Date: 2012-07-24
Classification: A61B,A61N

Abstract:
1. A method, comprising: receiving cardiac signals including tachycardia complexes and normal sinus rhythm (NSR) complexes, the tachycardia complexes associated with a tachycardia event; detecting the tachycardia event using the cardiac signals; extracting a plurality of tachycardia feature points from each of the tachycardia complexes and a plurality of NSR feature points from each of the NSR complexes; generating an NSR template using the plurality of NSR feature points extracted from the NSR complexes; generating an NSR filter output using the NSR template and the plurality of NSR feature points for each of the NSR complexes; determining an NSR filter output template using the NSR filter outputs each generated for one of the NSR complexes; generating a tachycardia complex output using the NSR filter output template and the plurality of tachycardia feature points for each of the tachycardia complexes; classifying the each of the tachycardia complexes as a ventricular tachycardia (VT) complex or a supraventricular tachycardia (SVT) complex using the tachycardia complex output and the NSR filter output template; declaring a VT event in response to a number of the tachycardia complexes classified as the VT complexes exceeding a predetermined threshold value; and delivering a ventricular tachycardia therapy in response to the VT event being declared.