System and method for diagnosing and tracking congestive heart failure based on the periodicity of cheyne-stokes respiration using an implantable medical device
First Claim
1. A method for distinguishing Cheyne-Stokes Respiration (CSR) within a patient caused by central sleep apnea (CSA) from CSR caused by congestive heart failure (CHF) using an implanted medical device, the method comprising:
- detecting a periodicity associated with CSR for the patient; and
determining whether the CSR of the patient is caused by CSA or by CHF based on the periodicity.
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Abstract
Techniques are provided for distinguishing Cheyne-Stokes Respiration (CSR) caused by central sleep apnea (CSA) from CSR caused by congestive heart failure (CHF) and for evaluating the severity of CHF, if present, based up CSR. A time period associated with the CSR is determined based upon separate evaluation of apnea and hyperpnea periods during CSR and then the time period is compared against a time-varying discrimination threshold derived from integrated thoracic impedance signals. If the time period exceeds the threshold, the CSR of the patient is caused by CHF; otherwise, the CSR is caused by CSA. Thereafter, the course of therapy delivered to the patient is controlled based upon the type of CSR. In addition, if the CSR is caused by CHF, the time period associated with CSR is employed to determine the severity of CHF—with longer time periods being associated with more severe CHF.
126 Citations
20 Claims
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1. A method for distinguishing Cheyne-Stokes Respiration (CSR) within a patient caused by central sleep apnea (CSA) from CSR caused by congestive heart failure (CHF) using an implanted medical device, the method comprising:
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detecting a periodicity associated with CSR for the patient; and determining whether the CSR of the patient is caused by CSA or by CHF based on the periodicity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for distinguishing Cheyne-Stokes Respiration (CSR) within a patient caused by central sleep apnea (CSA) from CSR caused by congestive heart failure (CHF) using an implanted medical device, comprising:
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a CSR periodicity determination unit operative to determine a periodicity associated with CSR for the patient; and a CSR discrimination unit operative to determine whether the CSR of the patient is caused by CSA or by CHF based on the periodicity associated with CSR for the patient. - View Dependent Claims (19)
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20. A system for distinguishing Cheyne-Stokes Respiration (CSR) within a patient caused by central sleep apnea (CSA) from CSR caused by congestive heart failure (CHF) using an implanted medical device, comprising:
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means for detecting the onset of CSR; means for detecting a periodicity associated with CSR for the patient; and means for determining whether the CSR of the patient is caused by CSA or by CHF based on the periodicity.
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Specification