Rhythm discrimination enhancement—AV drive

摘要

An apparatus comprises an implantable cardiac signal sensing circuit and a controller circuit. The implantable cardiac signal sensing circuit provides a sensed depolarization signal from a ventricle and a sensed depolarization signal from an atrium. The controller circuit includes a one-to-one detector circuit and a tachyarrhythmia discrimination circuit. The one-to-one detector circuit measures cardiac depolarization intervals of the atrium and the ventricle and determines whether a relationship of atrial depolarizations to ventricular depolarizations is substantially one-to-one. The tachyarrhythmia discrimination circuit classifies the episode as VT when detecting a shortening or prolonging of a V-V interval that immediately precedes the same shortening or prolonging of an A-A interval.

主权项

1. A system comprising:
an implantable device including: an implantable cardiac signal sensing circuit, configured to provide a sensed depolarization signal from a ventricle and a sensed depolarization signal from an atrium; and a controller circuit communicatively coupled to the implantable cardiac signal sensing circuit, wherein the controller circuit includes:
a one-to-one detector circuit configured to:
measure cardiac depolarization intervals of the atrium and the ventricle; anddetermine whether a relationship of atrial (A-A) depolarizations to ventricular (V-V) depolarizations is substantially one-to-one;a tachyarrhythmia discrimination circuit configured to:
detect an episode of tachyarrhythmia when the relationship atrial depolarizations to ventricular depolarizations is substantially one-to-one;generate an indication of VT when detecting one of a shortening or prolonging of an A-A interval during the episode that is immediately preceded by the same one of a shortening or prolonging of a V-V interval during the episode;generate an indication of a supra-ventricular tachycardia (SVT) event when detecting one of a shortening or prolonging of an A-A interval that immediately precedes the same one of a shortening or prolonging of the V-V interval during the episode; andclassify the tachyarrhythmia episode as one of VT or SVT according to the generated indications of VT and SVT.