Opto-electrical coherence detection of hemodynamically compromising arrhythmia
First Claim
1. An implantable cardiac stimulation device comprising:
- at least one lead adapted to be implanted in a patient so as to be able to deliver therapeutic stimulation to the heart of the patient;
a first sensor adapted to be implanted in the patient so as to sense a first signal indicative of electrophysiologic cardiac activity;
a second sensor adapted to be implanted in the patient so as to provide a second signal indicative of hemodynamic output;
a third sensor adapted to be implanted in the patient so as to provide a third signal indicative of patient activity; and
a controller that receives the signals from the first, second and third sensors, wherein the controller performs a frequency domain evaluation of the signals to determine whether the second signal is frequency related to the first signal and whether the second signal is frequency related to the third signal, and upon determining;
that the second signal is frequency related to the first signal, and the second signal is frequency related to the third signal, determines that the second signal is providing a reliable indication of the patient'"'"'s physiological condition; and
that the second signal is frequency related to the first signal, and the second signal is not frequency related to the third signal, determines that the second signal is providing a reliable indication of the patient'"'"'s physiological condition.
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Accused Products
Abstract
System and methods for assessing sensed signals for determining a reliability measure of their accuracy with respect to a patient'"'"'s true physiological status. As one example, the signals can include multiple, independently obtained signals, such as an electro-chemically based measure of cardiac activity and a plethysmography based measure of hemodynamic output which typically exhibit different morphologies and varying phase shifts with respect to each other. One manner of assessing the signals is to transform them into the frequency domain, such as via a Fast Fourier Transform (FFT), and evaluate them, such as by a coherence determination, to determine the degree of their mutual agreement. This can be used to assess the reliability of the sensing. Therapy can be delivered under certain observed conditions, such as a condition of hemodynamic insufficiency where anti-tachycardia pacing and/or shocking therapy can be delivered.
23 Citations
8 Claims
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1. An implantable cardiac stimulation device comprising:
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at least one lead adapted to be implanted in a patient so as to be able to deliver therapeutic stimulation to the heart of the patient; a first sensor adapted to be implanted in the patient so as to sense a first signal indicative of electrophysiologic cardiac activity; a second sensor adapted to be implanted in the patient so as to provide a second signal indicative of hemodynamic output; a third sensor adapted to be implanted in the patient so as to provide a third signal indicative of patient activity; and a controller that receives the signals from the first, second and third sensors, wherein the controller performs a frequency domain evaluation of the signals to determine whether the second signal is frequency related to the first signal and whether the second signal is frequency related to the third signal, and upon determining; that the second signal is frequency related to the first signal, and the second signal is frequency related to the third signal, determines that the second signal is providing a reliable indication of the patient'"'"'s physiological condition; and that the second signal is frequency related to the first signal, and the second signal is not frequency related to the third signal, determines that the second signal is providing a reliable indication of the patient'"'"'s physiological condition. - View Dependent Claims (2, 3, 7, 8)
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- 4. The device of 1, wherein the controller correlates the signals in the frequency domain by transforming the signals from a time domain into the frequency domain and evaluating the degree to which they share frequency components.
Specification