Patent ID: 8755874
Filing Date: 2014-06-17
Classification: A61B,A61N,G16H

Abstract:
1. An implantable medical device to discriminate between ventricular tachycardias (VTs) and supraventricular tachycardias (SVTs), said implantable medical device being configured to be connected to at least one medical lead adapted to be placed at or within a heart of a patient, said medical lead including at least one electrode adapted to sense electrical activity of said heart and to produce at least one signal representative of said electrical activity, said implantable medical device comprising: an intra-cardiac electrogram (IEGM) analyzing circuit that receives said signal representative of said electrical activity and to analyse IEGMs of said heart to detect an arrhythmia event; a sensing circuit that senses a respiratory pattern of said patient and to produce at least one signal representative of said respiratory pattern; a respiratory parameter determining circuit that determines at least one respiratory parameter reflecting characteristics of the respiratory pattern of said patient based on said sensed respiratory pattern and that determines a respiratory measure corresponding to a change of a rate of change of said at least one respiratory parameter; and an arrhythmia classifying circuit that classifies the detected arrhythmia event as a VT or SVT based on said respiratory measure, including classifying arrhythmia events that satisfy at least a first criterion for VT as an arrhythmia event requiring therapy; wherein said respiratory parameter determining circuit determines a respiratory frequency and a tidal volume using said sensed respiratory pattern and that determines a change of a range of change of a weighted combination of said respiratory frequency and said tidal volume.