IDENTIFICATION AND VISUALIZATION OF CARDIAC ACTIVIATION SEQUENCE IN MULTI-CHANNEL RECORDINGS
First Claim
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1. A method comprising:
- inserting a probe into a heart of a living subject, the probe having a plurality of electrodes;
recording respective intracardiac electrograms from the electrodes;
establishing annotations for each of the electrograms, including annotated activation times, the annotations being based on a change in voltage per unit time and defining a pattern comprising a velocity of electrical propagation in the heart;
within a time window detecting from the annotations a velocity pattern in the annotations of a set of the electrograms and the electrodes thereof;
sorting the electrograms by the annotated activation times;
sorting the electrograms by locations;
displaying the electrograms of the set, the electrograms being displayed in a graph of time-varying signal voltages; and
ablating a region of the heart based on the graph.
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Abstract
Intracardiac electrograms are recorded using a multi-electrode catheter and respective annotations established. Within a time window a pattern comprising a monotonically increasing local activation time sequence from a set of electrograms from neighboring electrodes is detected. The set is reordered and displayed for the operator.
5 Citations
20 Claims
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1. A method comprising:
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inserting a probe into a heart of a living subject, the probe having a plurality of electrodes; recording respective intracardiac electrograms from the electrodes; establishing annotations for each of the electrograms, including annotated activation times, the annotations being based on a change in voltage per unit time and defining a pattern comprising a velocity of electrical propagation in the heart; within a time window detecting from the annotations a velocity pattern in the annotations of a set of the electrograms and the electrodes thereof; sorting the electrograms by the annotated activation times; sorting the electrograms by locations; displaying the electrograms of the set, the electrograms being displayed in a graph of time-varying signal voltages; and ablating a region of the heart based on the graph. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 18, 19, 20)
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2. The method according to claim 2, wherein the electrograms are recorded concurrently.
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3. The method according to claim 3, further comprising the step of sorting the set according to positions on the probe of the electrodes thereof.
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11. An apparatus comprising:
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a probe having a plurality of electrodes on a distal portion thereof; electrical circuitry for recording respective time-varying electrograms from the electrodes when the probe is adapted to be at a location in a heart of a living subject; a memory for storing the electrograms; a display; and a processor connected to the memory and operative to; record respective intracardiac electrograms from the electrodes; establish annotations for each of the electrograms, including annotated activation times, the annotations being based on a change in voltage per unit time and defining a pattern comprising a velocity of electrical propagation in the heart; within a time window detect from the annotations a velocity pattern in the annotations of a set of the electrograms and the electrodes thereof; sort the electrograms by the annotated activation times; sort the electrograms by locations; display the electrograms of the set, the electrograms being displayed in a graph of time-varying signal voltages; and ablate a region of the heart based on the graph. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification