Post-hoc atrial fibrillation detection
AssigneeCardiac Pacemakers, Inc.
InventorsDavid L. Perschbacher, Sunipa Saha
Life of this patent
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Abstract
An apparatus comprises an arrhythmia detection circuit configured to: detect atrial arrhythmia in a first portion of a sensed cardiac signal using a first arrhythmia detection criteria, wherein the sensed cardiac signal is representative of cardiac activity of a subject; and upon detection of the atrial arrhythmia, analyze a second portion of the cardiac signal that is prior in time to the first portion using a second different arrhythmia detection criteria to detect the presence or absence of the atrial arrhythmia in the second portion of the cardiac signal.
Claims19
An apparatus comprising:
- a sensing circuit coupled to the arrhythmia detection circuit, and configured to generate a sensed cardiac signal;
- an arrhythmia detection circuit configured to:
- detect a cardiac arrhythmia in a first portion of the cardiac signal using a first arrhythmia detection criteria, wherein the cardiac signal is representative of cardiac activity of a subject;
- upon detection of the cardiac arrhythmia, analyze a second portion of the cardiac signal that is prior in time to the first portion using a second different arrhythmia detection criteria to detect the presence or absence of the cardiac arrhythmia in the second portion of the cardiac signal;
- add a duration of the prior sensed cardiac signal to a time duration of an arrhythmia episode when arrhythmia is detected in the prior sensed cardiac signal using the different second detection criteria;
- and generate a value of total time duration of the arrhythmia episode.
A method of controlling operation of an ambulatory medical device, the method comprising:
- sensing a cardiac signal representative of cardiac activity of a subject;
- detecting an episode of cardiac arrhythmia in the sensed cardiac signal using one or more first arrhythmia detection criteria and timing a duration of the arrhythmia episode;
- applying, when the episode of arrhythmia is detected, different one or more arrhythmia detection criteria to a duration of the sensed cardiac signal prior to the detected episode of arrhythmia;
- adding the duration of the prior sensed cardiac signal to the time duration of the arrhythmia episode when arrhythmia is detected in the prior sensed cardiac signal using the different arrhythmia detection criteria;
- and
- providing a total time duration of the detected arrhythmia episode to a user or process.
A system comprising:
- a cardiac signal sensing circuit operatively coupled to electrodes and configured to provide a sensed ventricular cardiac signal of a subject;
- and
- an arrhythmia detection circuit operatively coupled to the cardiac signal sensing circuit and configured to:
- detect an episode of atrial arrhythmia in the sensed ventricular cardiac signal using a first AF detection criteria;
- apply different AF detection criteria to a duration of the sensed cardiac signal prior to the detected episode of atrial arrhythmia upon detection of the episode of atrial arrhythmia;
- and
- determine a value of total time duration of the detected atrial arrhythmia using a first duration of atrial arrhythmia detected using the first detection criteria and a second duration of atrial arrhythmia using the second detection criteria.
Dependencies are inferred from the claim text.