Patent ID: 9149645
Filing Date: 2015-10-06
Classification: A61B,A61N

Abstract:
1. An implantable cardiac stimulus device comprising electrodes coupled to operational circuitry for sensing cardiac activity and detecting events in the sensed cardiac activity and delivering therapy in response to identified conditions, in which the operational circuitry is configured to use one or more arrhythmia identification parameters which can be modified within predefined ranges, wherein the operational circuitry is configured to: establish a preliminary identification of a potentially treatable arrhythmia using a set of detected events; determine whether the set of detected events are varying in shape or consistent in shape using a predefined parameter; if the set of detected events is varying in shape, apply a first value for the arrhythmia detection parameter to assess whether the preliminary identification of a potentially treatable arrhythmia should be declared as an episode of treatable arrhythmia; and if the set of detected events is not varying in shape, apply a second value for the arrhythmia detection parameter to assess whether the preliminary identification of a potentially treatable arrhythmia should be declared as an episode of treatable arrhythmia; wherein the second value is different from the first value; and wherein the operational circuitry is further configured to: identify a nonsustained episode of potentially treatable arrhythmia and, in response thereto, modify the second value for the arrhythmia detection parameter, and set the first value for the arrhythmia detection parameter to a predefined default value for the modified arrhythmia detection parameter.