Cross-checking of transthoracic impedance and acceleration signals
First Claim
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1. An implantable system configured to be coupled to a heart having a first chamber and a second chamber, the system comprising:
- a first impedance sensor configured to measure a first impedance associated with the first chamber;
a second impedance sensor configured to measure a second impedance associated with the second chamber; and
a processor coupled to the first impedance sensor and the second impedance sensor, the processor configured to determine a first ventilation rate using the first impedance, determine a second ventilation rate using the second impedance, and compare the first ventilation rate to the second ventilation rate to determine a difference between the first ventilation rate and 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.
174 Citations
20 Claims
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1. An implantable system configured to be coupled to a heart having a first chamber and a second chamber, the system comprising:
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a first impedance sensor configured to measure a first impedance associated with the first chamber; a second impedance sensor configured to measure a second impedance associated with the second chamber; and a processor coupled to the first impedance sensor and the second impedance sensor, the processor configured to determine a first ventilation rate using the first impedance, determine a second ventilation rate using the second impedance, and compare the first ventilation rate to the second ventilation rate to determine a difference between the first ventilation rate and the second ventilation rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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measuring a first impedance associated with a first chamber of a heart; measuring a second impedance associated with a second chamber of the heart; determining a first ventilation rate using the first impedance; determining a second ventilation rate using the second impedance; comparing the first ventilation rate to the second ventilation rate; and adjusting a therapy using an outcome of the comparison of the first ventilation rate to the second ventilation rate. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method, comprising:
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sensing a first acceleration signal indicative of activity of a heart using a first accelerometer; sensing a second acceleration signal indicative of activity of the heart using a second accelerometer; determining whether the first acceleration signal is substantially different from the second acceleration signal; delivering a first therapy regimen to the heart in response to the first acceleration signal not being substantially different from the second acceleration signal; sensing an impedance signal indicative of ventilation; delivering a second therapy regimen to the heart in response to the first acceleration signal being substantially different from the second acceleration signal, the second therapy regimen selected as a function of the impedance signal. - View Dependent Claims (19, 20)
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Specification