System and method for detecting pulmonary edema based on impedance measured using an implantable medical device during a lead maturation interval
First Claim
1. A method for use with an implantable medical device for implant within a patient along with at least one lead, the method comprising:
- determining whether the lead is within an initial post-implant interval following lead implant during which lead maturation occurs, wherein determining whether the lead is within the initial post-implant interval includes;
determining the duration of the initial post-implant interval by adding a lead maturation period to a long-term average window duration; and
tracking an amount of time since lead implant to determine whether the lead is within the initial post-implant interval;
detecting values representative of transthoracic impedance within the patient using the lead; and
detecting a medical condition within the patient during the initial post-implant interval based on the values representative of transthoracic impedance using a set of detection parameters.
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Accused Products
Abstract
Techniques are provided for use by implantable medical devices such as cardiac resynchronization therapy (CRT) devices for detecting pulmonary edema based on transthoracic impedance sensed using cardiac pacing/sensing leads, wherein detection can be performed while lead maturation occurs. Briefly, the implantable device determines whether the leads are within an initial post-implant interval following implant during which lead maturation generally occurs. The device then detects pulmonary edema or related medical conditions within the patient based on transthoracic impedance using a set of detection parameters adjusted for use during the post-implant interval. Thus, rather than “blanking” impedance data during lead maturation, the device instead detects and processes impedance during this period to identify possible episodes of pulmonary edema so that appropriate measures can be undertaken, such as delivery of warnings or titration of appropriate medications.
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Citations
18 Claims
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1. A method for use with an implantable medical device for implant within a patient along with at least one lead, the method comprising:
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determining whether the lead is within an initial post-implant interval following lead implant during which lead maturation occurs, wherein determining whether the lead is within the initial post-implant interval includes; determining the duration of the initial post-implant interval by adding a lead maturation period to a long-term average window duration; and tracking an amount of time since lead implant to determine whether the lead is within the initial post-implant interval; detecting values representative of transthoracic impedance within the patient using the lead; and detecting a medical condition within the patient during the initial post-implant interval based on the values representative of transthoracic impedance using a set of detection parameters. - View Dependent Claims (2, 3, 4, 5)
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6. A method for use with an implantable medical device for implant within a patient along with at least one lead, the method comprising:
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determining whether the lead is within an initial post-implant interval following lead implant during which lead maturation occurs; detecting values representative of transthoracic impedance within the patient using the lead; and detecting a medical condition within the patient during the initial post-implant interval based on the values representative of transthoracic impedance using a set of detection parameters, wherein detecting a medical condition within the patient during the initial post-implant interval includes; retrieving the set of detection parameters; adjusting the parameters when the lead is determined to be within the initial post-implant interval; and detecting a first episode of the medical condition during the initial post-implant interval by applying the adjusted detection parameters to the values representative of transthoracic impedance detected during the initial post-implant interval, wherein the set of detection parameters includes a long-term average window duration, a short-term average window duration, and a detection threshold. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for use with an implantable medical device for implant within a patient along with at least one lead, the method comprising:
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determining whether the lead is within an initial post-implant interval following lead implant during which lead maturation occurs, wherein determining whether the lead is within the initial post-implant interval comprises; determining the duration of the initial post-implant interval by adding a lead maturation period to a long-term average window duration; and tracking an amount of time since lead implant to determine whether the lead is within the initial post-implant interval; detecting values representative of transthoracic impedance within the patient using the lead; retrieving a set of detection parameters; adjusting the detection parameters when the lead is within an initial post-implant interval; detecting a medical condition within the patient during the initial post-implant interval based on the values representative of transthoracic impedance; and using the set of adjusted detection parameters. - View Dependent Claims (17, 18)
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Specification