Cross-checking of transthoracic impedance and acceleration signals
First Claim
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1. A device configured to be coupled to a heart, the device comprising:
- an exciter to generate a current field in the heart;
a first pair of electrodes;
a second pair of electrodes; and
a processor coupled to the first pair of electrodes and the second pair of electrodes and adapted to generate first impedance information as a function of a first voltage received by the first pair of electrodes in response to the current field, generate second impedance information as a function of a second voltage received by the second pair of electrodes in response to the current field, determine a first ventilation rate using the first impedance information, determine a second ventilation rate using the second impedance information, and compare the first ventilation rate to the second ventilation rate to determine whether the first ventilation rate differs from the second ventilation rate.
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Abstract
A first chamber minute ventilation rate is determined based on a first transthoracic impedance signal received from a first chamber of a heart and a second chamber minute ventilation rate is determined based on a second transthoracic impedance signal received from a second chamber of the heart. A processor compares the minute ventilation rates to determine a rate. In one embodiment, an accelerometer sensor provides data for evaluating propriety of a rate. Before implementing a rate change, signals from multiple sensors are cross-checked.
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Citations
25 Claims
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1. A device configured to be coupled to a heart, the device comprising:
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an exciter to generate a current field in the heart; a first pair of electrodes; a second pair of electrodes; and a processor coupled to the first pair of electrodes and the second pair of electrodes and adapted to generate first impedance information as a function of a first voltage received by the first pair of electrodes in response to the current field, generate second impedance information as a function of a second voltage received by the second pair of electrodes in response to the current field, determine a first ventilation rate using the first impedance information, determine a second ventilation rate using the second impedance information, and compare the first ventilation rate to the second ventilation rate to determine whether the first ventilation rate differs from the second ventilation rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implantable system configured to be coupled to a heart in a thorax, the system comprising:
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a plurality of sensors, each sensor adapted to sense a thoracic parameter and provide a signal, the plurality of sensors including a first ventilation sensor adapted to sense a first impedance associated with a first chamber of the heart in the thorax and a second ventilation sensor adapted to sense a second impedance associated with a second chamber of the heart; a therapy circuit adapted to deliver therapy to the heart; and a processor coupled to each sensor of the plurality of sensors and coupled to the therapy circuit and wherein the processor is adapted to compare the signals received from the plurality of sensors and adjust a pacing rate using a result of the comparison. - View Dependent Claims (10, 11)
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12. An implantable device comprising:
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an excitation channel to generate a current field in a heart; a first impedance sensor to generate a first impedance signal based on a first voltage associated with a first chamber of the heart; a second impedance sensor to generate a second impedance signal based on a second voltage associated with a second chamber of the heart; a first accelerometer to generate a first acceleration signal based on a detected acceleration associated with the heart; a signal processor coupled to the first impedance sensor and adapted to generate a first ventilation signal using the first impedance signal and coupled to the second impedance sensor and adapted to generate a second ventilation signal using the second impedance signal; and a processor adapted to receive the first ventilation signal, the second ventilation signal and the first acceleration signal and adapted to cross check the first ventilation signal and the second ventilation signal with the first acceleration signal. - View Dependent Claims (13, 14, 15)
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16. A method comprising:
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receiving a plurality of input signals corresponding to two or more chambers of a heart, the plurality of input signals including a first ventilation rate derived from a first impedance associated with a first chamber of the heart and a second ventilation rate derived from a second impedance associated with a second chamber of the heart; using a processor to detect a similarity between signals of the plurality of input signals including at least the first ventilation rate and the second ventilation rate; and delivering therapy to the heart based on the detected similarity. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A system configured to be coupled to a thorax including a heart, the system comprising:
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means for generating a current field in the thorax; means for generating a first ventilation signal based on a first transthoracic impedance measured by a first pair of electrodes responsive to a first chamber of the heart in the thorax; means for generating a second ventilation signal based on a second transthoracic impedance measured by a second pair of electrodes responsive to a second chamber of the heart; first accelerometer means adapted to be coupled to the heart and adapted to provide a first acceleration signal as a function of a sensed acceleration associated with the heart along a first axis; processor means coupled to the means for generating the first ventilation signal and coupled to the means for generating the second ventilation signal and coupled to the first accelerometer means and adapted to generate a code as a function of a detected similarity between the first ventilation signal, the second ventilation signal and the first acceleration signal; and therapy means coupled to the processor means and adapted to deliver therapy to the heart as a function of the detected similarity. - View Dependent Claims (24, 25)
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Specification