Techniques for Correlating Thoracic Impedance with Physiological Status
First Claim
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1. An implantable medical device (IMD) comprising:
- a mechanism operable to monitor patient postures;
a mechanism operable to monitor patient thoracic impedance values;
a mechanism to correlate individual postures with individual thoracic impedance values; and
,a mechanism to detect heart failure from the correlated individual postures and individual thoracic impedance values in view of a patient condition prior to implantation of the IMD.
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Abstract
Exemplary techniques for correlating thoracic impedance values with physiological status are described. One technique involves an implantable medical device (IMD) that includes means for correlating thoracic impedance values with a patient'"'"'s physiological status and means for interpreting the correlated thoracic impedance values utilizing a patient-based threshold to detect a heart failure condition.
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Citations
38 Claims
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1. An implantable medical device (IMD) comprising:
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a mechanism operable to monitor patient postures; a mechanism operable to monitor patient thoracic impedance values; a mechanism to correlate individual postures with individual thoracic impedance values; and
,a mechanism to detect heart failure from the correlated individual postures and individual thoracic impedance values in view of a patient condition prior to implantation of the IMD. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable medical device (IMD) comprising:
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a mechanism operative to determine when a patient is in a supine posture; a mechanism operative to measure thoracic impedance values when the patient is in the supine posture; and
,a mechanism operative to determine an average thoracic impedance value from the measured thoracic impedance values for a first day and an average thoracic impedance value for a second day and to compare the averages to detect heart failure in the patient. - View Dependent Claims (9, 10)
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11. An implantable medical device (IMD) comprising:
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means for correlating thoracic impedance values with a patient'"'"'s physiological status; and
,means for interpreting the correlated thoracic impedance values utilizing a patient-based threshold to detect a heart failure condition. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer-implemented method comprising:
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sensing thoracic impedance values from a patient; determining the patient'"'"'s posture; correlating the patient'"'"'s posture and the thoracic impedance values to calculate a first average thoracic impedance for a first posture and a second average impedance for a second posture; and
,detecting a pulmonary edema condition of the patient by comparing the first average to the second average. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A computer-readable media that when stored on an implantable medical device (IMD) causes the IMD to perform acts comprising:
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for individual days, correlating patient posture and thoracic impedance values to determine a first average thoracic impedance value for a generally horizontal patient posture and a second average thoracic impedance value for a generally vertical patient posture, and for individual days calculating a difference between the first average thoracic impedance value and the second average thoracic impedance value; and
,tracking changes to the difference over a plurality of days to detect a pulmonary edema condition of the patient. - View Dependent Claims (31, 32, 33)
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34. A method comprising:
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obtaining patient information prior to a sample period where thoracic impedance values are measured; generating an individualized patient-based threshold utilizing the patient information; and
,interpreting the thoracic impedance values from the sample period in light of the individualized patient-based threshold. - View Dependent Claims (35, 36, 37, 38)
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Specification