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Identifying activations in atrial fibrillation electrogram

一种电激活、电接口的技术，应用在电生理学领域

Pending Publication Date: 2019-11-29
BIOSENSE WEBSTER (ISRAEL) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional methods of annotating electrogram signals to determine the local activation time (LAT) are not suitable for this type of arrhythmia

Method used

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  • Identifying activations in atrial fibrillation electrogram
  • Identifying activations in atrial fibrillation electrogram
  • Identifying activations in atrial fibrillation electrogram

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Embodiment Construction

[0031] overview

[0032] In some instances, a physician may wish to understand the manner in which a wavefront of electrical activation propagates through a subject's cardiac tissue during each cardiac cycle. In such cases, multiple electrodes may be used to sense or record electrogram signals at different corresponding locations on the cardiac tissue. For each signal, the physician may attempt to identify any points of electrical activation, ie any points in the signal that correspond to instances where the wavefront passes through the site where the signal was acquired. Unfortunately, however, in the case of atrial fibrillation or other cardiac arrhythmias, it can be difficult even for experienced EP physicians to identify any activation points due to irregularities and / or variability in the electrogram signal . For example, regular electrograms include regularly spaced spikes that clearly indicate activation, whereas irregular electrograms may exhibit various forms and ...

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Abstract

The invention is entitled identifying activations in atrial fibrillation electrogram. The invention provides a system that includes an electrical interface and a processor configured to receive, via the electrical interface, a signal sensed by at least one electrode in contact with tissue of a subject's heart, the signal spanning successive time periods that are each of length Ti and including multiple signal points; to calculate respective thresholds for the time periods; to select a set of points that includes, for each of the time periods, a signal point of greatest magnitude in the time period, provided that the greatest magnitude is greater than the threshold for the time period; to remove, from the set, one of any pair of the selected points that are within an interval T2 of one another, T2 being less than Ti; and to generate, subsequently to the removing, an output that is based on the points remaining in the set corresponding to respective electrical activations of the tissue.

Description

technical field [0001] The present invention relates generally to the field of electrophysiology, and in particular to cardiac arrhythmias such as atrial fibrillation. Background technique [0002] Atrial fibrillation is an abnormal heart rhythm characterized by rapid and irregular beating of the atria. Typically, the shape of the atrial fibrillation ECG varies at different anatomical sites and / or over the duration of the recording. Therefore, conventional methods of noting electrogram signals to determine the local activation time (LAT) are not suitable for this type of arrhythmia. [0003] U.S. Patent Application Publication 2015 / 0208942, the disclosure of which is incorporated herein by reference, describes cardiac catheterization performed by inserting a probe with electrodes into the heart of a living subject and recording A bipolar electrogram and a monopolar electrogram of one of the electrodes at a location, and a window of interest defining a rate of change of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0402A61B5/042A61B5/046A61B5/308A61B5/361A61B5/296A61B5/352
CPCA61B5/7246A61B5/316A61B5/361A61B5/283A61B5/287A61B5/318A61B5/6852A61B5/6869A61B5/7235A61B5/349A61B5/25A61B18/1492A61B5/7225A61B2018/00351A61B2017/00256A61B2018/00577A61B2018/00839A61B5/352
Inventor Z.扎旦A.图格曼
Owner BIOSENSE WEBSTER (ISRAEL) LTD
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