Arrhythmia classification system with reliability indication that allows for low quality input signals in pacemakers
First Claim
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1. An implantable pacemaker comprising:
- a sensor for sensing intrinsic events in a patient'"'"'s heart;
a classifier classifying said events into one of several groups and generating control signals corresponding to a respective one of said groups, said control signals defining a therapy appropriate to each of said group;
a reliability detector determining a reliability of said classifier, said reliability detector generating an indication if said reliability detector determines that said classifier made an unreliable classification; and
a pulse generator receiving said control signals and said indication and generating in response first therapeutic rules in the presence of said indication and second therapeutic rules in the absence of said indication;
wherein said reliability detector includes a noise sensor for detecting noise from said sensor, a feature extractor for extracting an event feature of sensed events in the presence of noise; and
a comparator for comparing said event feature to a threshold, said indication being generated based on the comparison.
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Abstract
An implantable cardiac device wherein a reliability indicator is developed for cardiac classification based on the presence or absence of noise. If the classification is unreliable a robust therapy is applied until the cardiac condition is confirmed.
94 Citations
15 Claims
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1. An implantable pacemaker comprising:
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a sensor for sensing intrinsic events in a patient'"'"'s heart; a classifier classifying said events into one of several groups and generating control signals corresponding to a respective one of said groups, said control signals defining a therapy appropriate to each of said group; a reliability detector determining a reliability of said classifier, said reliability detector generating an indication if said reliability detector determines that said classifier made an unreliable classification; and a pulse generator receiving said control signals and said indication and generating in response first therapeutic rules in the presence of said indication and second therapeutic rules in the absence of said indication; wherein said reliability detector includes a noise sensor for detecting noise from said sensor, a feature extractor for extracting an event feature of sensed events in the presence of noise; and a comparator for comparing said event feature to a threshold, said indication being generated based on the comparison.
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2. A pacemaker for implantation in a patient, said pacemaker comprising:
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a sensor sensing a cardiac event and generating a sensed signal; a pulse generator for generating therapeutic pulses in response to commands; a classifier classifying a condition of the patient'"'"'s heart based on said sensed signal and generating a corresponding therapy signal; a reliability detector detecting a reliability of said therapy signal; and
generating a reliability indication; anda controller receiving said therapy signal and said reliability indication and generating said commands. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
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14. A method of applying cardiac therapy to a patient using an implantable device comprising the steps of:
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sensing a cardiac event and generating a response to a sense signal; sensing a noise signal associated with said cardiac event; classifying said sense signal as a first cardiac condition in the absence of noise; analyzing said sensed signal in the presence of noise to determine if center preselected criteria are met; classifying said sense signal as a second condition in the presence of said criteria; and applying therapeutic pulses in accordance with all of said first and second conditions.
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Specification