RHYTHM DISCRIMINATOR WITH IMMUNITY TO BODY POSTURE

摘要

An implantable medical device system includes an implantable cardioverter defibrillator (ICD) for detecting and treating ventricular tachycardia (VT). The ICD includes a sensing module for sensing a cardiac signal from available cardiac signal sensing vectors. A control module generates morphology templates of the cardiac signals for multiple patient postures for each of the available sensing vectors and determines a set of posture-independent template features. An unknown cardiac rhythm is classified in response to comparing features of a cardiac signal received during the unknown rhythm to the set of posture-independent features.

主权项

1. A method performed by an implantable medical device, comprising:
sensing a first cardiac signal during a known cardiac rhythm from each of a plurality of available sensing vectors, for each of the plurality of available sensing vectors, generating a plurality of morphology templates of the first cardiac signal for each of a plurality of patient postures; determining a set of template features from each of the plurality of morphology templates; for each of the plurality of available sensing vectors, comparing the set of template features from one of the plurality of morphology templates corresponding to one of the plurality of postures to each of the sets of template features from all of the other morphology templates corresponding to all of the other of the plurality of postures; for each of the plurality of available sensing vectors, storing a set of posture-independent template features in response to the comparing; sensing a second cardiac signal during an unknown cardiac rhythm from at least one of the plurality of available sensing vectors; determining features from the second cardiac signal that are analogous to the set of posture-independent template features stored for the at least one of the plurality of available sensing vectors; comparing the features determined from the second cardiac signal to the analogous set of posture-independent template features; and classifying the unknown cardiac rhythm in response to comparing the features determined from the second cardiac signal to the analogous set of posture-independent template features.