Discrimination of supraventricular tachycardia and ventricular tachycardia events
First Claim
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.
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Abstract
A method and system for discrimination of supraventricular tachycardia and ventricular tachycardia events. Morphological features points are extracted from normal sinus rhythm (NSR) complexes and used to generate a NSR template. A numerical convolution is performed using the NSR template and the feature points for each sensed NSR to give a NSR filter output. Using a plurality of NSR complexes, a median NSR filter output template is determined, where the median NSR filter output template has a median value for each value in the NSR filter output. The median NSR filter output template is then used during a tachycardia event to distinguish tachycardia events as either ventricular tachycardia events or supraventricular tachycardia events.
185 Citations
17 Claims
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1. A method, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification