Automatic determination and selection of filtering in a cardiac rhythm management device

Abstract

Methods and / or device facilitating and selecting among multiple modes of filtering a cardiac electrical signal, in which one filtering mode includes additional high pass filtering of low frequency signals, relative to the other filtering mode. The selection filtering modes may include comparing sensed signal amplitude to one or more thresholds, using the multiple modes of filtering. In another example, an additional high pass filter is enabled, over and above a default or baseline filtering mode, and the detected cardiac signal is monitored for indications of possible undersensing, and / or fordrops in amplitude toward a threshold, and the additional high pass filter may be disabled upon finding of possible undersensing or drop in signal amplitude.

Description

[0001] Cross References to Related Applications [0002] This application claims benefit and priority to U.S. Provisional Patent Application Serial No. 62 / 262,043, entitled "Automatic Determination and Selection of Filtering in Cardiac Rhythm Management Devices," filed December 2, 2015, the disclosure of which is incorporated by reference This article. Background technique [0003] Many cardiac rhythm management products are available for the diagnosis and treatment of various conditions. These may include, for example, subcutaneous, intravenous or intracardiac therapeutic devices such as pacemakers, defibrillators and resynchronization devices. Implantable, external and / or wearable cardiac monitors are also available. External or wearable therapy products may include defibrillator vests and external pacemakers and automated external defibrillators. [0004] Derived from CLINICAL CARDAIC PACING AND DEFIBRILLATION by Ellenbogen et al., 2nd Ed. (W.B. Saunders Co. 2000) figur...

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Problems solved by technology

[0005] T-wave filtering may be desirable for systems that are at risk of T-wave overdetection, which can lead to overcounting of cardiac cycles and possibly inappropriate therapy

Although filtering T waves can reduce the potential for overdetection and inappropriate treatment, it is also necessary to ensure that filtering for T waves does not lead to abnormalities in cardiac rhythms such as ventricular fibrillation or polymorphic ventricular tachycardia. Insufficient speed sensing

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