System and method for detecting worsening of heart failure based on rapid shallow breathing index
First Claim
1. A system for monitoring a progression of heart failure in a patient, the system comprising:
- a sensor configured to provide one or more signals indicative of respiration of a patient;
circuitry coupled to the sensor, the circuitry configured to;
determine a plurality of respiration rate and tidal volume measurements during each of a plurality of twenty-four hour periods using the one or more signals indicative of the respiration of the patient;
determine a rapid shallow breathing index (RSBI) value for a selected portion of each of a plurality of the twenty-four hour periods based, at least in part, on one or more of the corresponding plurality of the respiration rate and tidal volume measurements;
determine a first RSBI aggregate based, at least in part, on the RSBI values that fall within a first time window having a first duration;
determine a second RSBI aggregate based, at least in part, on the RSBI values that fall within a second time window having a second duration, wherein the first duration is different than the second duration;
determine a relationship between the first RSBI aggregate determined for the first time window and the second RSBI aggregate determined for the second time window; and
an output coupled to the circuitry for providing an output signal indicative of an HF status of the patient based, at least in part, on the determined relationship between the first RSBI aggregate determined for the first time window and the second RSBI aggregate determined for the second time window,wherein the RSBI aggregates for the selected portion of each of the plurality of twenty-four hour period are determined, in part, by a ratio between the corresponding plurality of respiration rate and tidal volume measurements, and wherein the RSRI aggregates for the selected portion of each of the plurality of twenty-four hour period are defined by a minimum or a lower percentile of the plurality of the ratios between the corresponding plurality of respiration rate measurements and the corresponding plurality of tidal volume measurements.
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Accused Products
Abstract
Systems and methods for detecting a worsening of patient'"'"'s heart failure condition based, at least in part, on an increasing trend in a representative rapid shallow breathing index (RSBI) value over multiple days. The RSBI value may be a minimum RSBI, and more particularly may be a minimum RSBI value determined for an afternoon portion of each of the multiple days. The minimum RSBI value measured during an afternoon portion of the day may be more sensitive to changes in a patient'"'"'s respiration, particularly when a patient is expected to be more active, and thus, may more readily exhibit an increasing trend when patient'"'"'s heart failure is in decline.
142 Citations
18 Claims
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1. A system for monitoring a progression of heart failure in a patient, the system comprising:
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a sensor configured to provide one or more signals indicative of respiration of a patient; circuitry coupled to the sensor, the circuitry configured to; determine a plurality of respiration rate and tidal volume measurements during each of a plurality of twenty-four hour periods using the one or more signals indicative of the respiration of the patient; determine a rapid shallow breathing index (RSBI) value for a selected portion of each of a plurality of the twenty-four hour periods based, at least in part, on one or more of the corresponding plurality of the respiration rate and tidal volume measurements; determine a first RSBI aggregate based, at least in part, on the RSBI values that fall within a first time window having a first duration; determine a second RSBI aggregate based, at least in part, on the RSBI values that fall within a second time window having a second duration, wherein the first duration is different than the second duration; determine a relationship between the first RSBI aggregate determined for the first time window and the second RSBI aggregate determined for the second time window; and an output coupled to the circuitry for providing an output signal indicative of an HF status of the patient based, at least in part, on the determined relationship between the first RSBI aggregate determined for the first time window and the second RSBI aggregate determined for the second time window, wherein the RSBI aggregates for the selected portion of each of the plurality of twenty-four hour period are determined, in part, by a ratio between the corresponding plurality of respiration rate and tidal volume measurements, and wherein the RSRI aggregates for the selected portion of each of the plurality of twenty-four hour period are defined by a minimum or a lower percentile of the plurality of the ratios between the corresponding plurality of respiration rate measurements and the corresponding plurality of tidal volume measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for monitoring a progression of heart failure in a patient, the system comprising:
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a sensor configured to detect respiration in a patient and configured to generate signals indicative of the patient'"'"'s respiration over multiple twenty-four hour periods, circuitry coupled to the sensor, the circuitry configured to; determine a plurality of respiration rate and tidal volume measurements for each of multiple twenty-four hour periods using the signals indicative of the respiration of the patient; determine a representative RSBI value for a selected portion of each of the multiple twenty-four hour periods based, at least in part, on the corresponding plurality of respiration rate and tidal volume measurements; determine a first RSBI aggregate based, at least in part, on the RSBI values that fall within a first time window having a first duration; determine a second RSBI aggregate based, at least in part, on the RSBI values that fall within a second time window having a second duration, wherein the first duration is different than the second duration; determine a relationship between the first RSBI aggregate determined for the first time window and the second RSBI aggregate determined for the second time window; and an output coupled to the circuitry for providing an output signal indicative of a current heart failure status of the patient based on a change in the representative RSBI value over multiple twenty-four hour periods, wherein the RSBI aggregates for the selected portion of each of the plurality of twenty-four hour period are determined, in part, by a ratio between the corresponding plurality of respiration rate and tidal volume measurements, and wherein the RSBI aggregates for the selected portion of each of the plurality of twenty-four hour period are defined by a minimum or a lower percentile of the plurality of the ratios between the corresponding plurality of respiration rate measurements and the corresponding plurality of tidal volume measurements. - View Dependent Claims (13, 14, 15, 16)
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17. A method of determining a progression of heart failure in a patient, the method comprising:
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detecting respiration in a patient over multiple twenty-four hour periods using a sensor; the sensor generating signals indicative of the respiration of the patient over the multiple twenty-four hour periods; determining a plurality of respiration rate measurements and tidal volume measurements for each of the multiple twenty-four hour periods using the signals indicative of the respiration of the patient; determining a representative RSBI value for a selected portion of each of the multiple twenty-four hour periods based, at least in part, on the corresponding plurality of respiration rate measurements and tidal volume measurements; determining a first RSBI aggregate based, at least in part, on the RSBI values that fall within a first time window having a first duration; determining a second RSBI aggregate based, at least in part, on the RSBI values that fall within a second time window having a second duration, wherein the first duration is different than the second duration; determining a relationship between the first RSBI aggregate determined for the first time window and the second RSBI aggregate determined for the second time window; and generating an output signal indicative of a current heart failure status of the patient based on a change in the representative RSBI value over multiple twenty-four hour periods, wherein the RSBI aggregates for the selected portion of each of the plurality of twenty-four hour period are determined, in part, by a ratio between the corresponding plurality of respiration rate and tidal volume measurements, and wherein the RSBI aggregates for the selected portion of each of the plurality of twenty-four hour period are defined by a minimum or a lower percentile of the plurality of the ratios between the corresponding plurality of respiration rate measurements and the corresponding plurality of tidal volume measurements. - View Dependent Claims (18)
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Specification