METHODS AND DEVICES IMPLEMENTING DUAL CRITERIA FOR ARRHYTHMIA DETECTION

摘要

Methods and devices providing multiple criteria for use in arrhythmia identification. Based on inputs including defined rules or parameters, one of a more conservative or more aggressive set of arrhythmia identification parameters can be selected. One or the other of the selectable sets of arrhythmia identification parameters may also be adaptive or modifiable during the use of the system, for example, in response to identified nonsustained episodes, the more conservative set of arrhythmia identification parameters can be modified to become still more conservative. Such modification of arrhythmia identification criteria allows reduced time to therapy when indicated, while allowing more deliberate decisions in other circumstances.

主权项

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.