Using multiple diagnostic parameters for predicting heart failure events
First Claim
1. A system comprising:
- at least one sensor; and
one or more processors configured to;
monitor at least one primary diagnostic parameter and at least one secondary diagnostic parameter of a patient based on at least one signal from the at least one sensor;
change an index value over time based on the primary diagnostic parameter, wherein the index value is indicative of worsening heart failure of the patient;
detect worsening heart failure in the patient when the index value is greater than an upper threshold of a threshold zone, the upper threshold and a lower threshold defining the threshold zone;
determine whether worsening heart failure is detected in the patient based on the secondary diagnostic parameter when the index value is within the threshold zone; and
adjust the threshold zone.
1 Assignment
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Accused Products
Abstract
Techniques for using multiple physiological parameters to provide an early warning for worsening heart failure are described. A medical device monitors a primary diagnostic parameter that is indicative of worsening heart failure, such as intrathoracic impedance or pressure, and one or more secondary diagnostic parameters. The medical device detects worsening heart failure in the patient based on the primary diagnostic parameter when an index that is changed over time based on the primary diagnostic parameter value is outside a range of values, termed the threshold zone. When the index is within the threshold zone, the medical device detects worsening heart failure in the patient based on the one or more secondary diagnostic parameters. Upon detecting worsening heart failure, the medical device may, for example, provide an alert that enables the patient to seek medical attention before experiencing a heart failure event.
101 Citations
26 Claims
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1. A system comprising:
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at least one sensor; and one or more processors configured to; monitor at least one primary diagnostic parameter and at least one secondary diagnostic parameter of a patient based on at least one signal from the at least one sensor; change an index value over time based on the primary diagnostic parameter, wherein the index value is indicative of worsening heart failure of the patient; detect worsening heart failure in the patient when the index value is greater than an upper threshold of a threshold zone, the upper threshold and a lower threshold defining the threshold zone; determine whether worsening heart failure is detected in the patient based on the secondary diagnostic parameter when the index value is within the threshold zone; and adjust the threshold zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A computer-readable medium comprising instructions that cause one or more processors to:
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monitor at least one primary diagnostic parameter and at least one secondary diagnostic parameter of a patient; change an index value over time based on the primary diagnostic parameter, wherein the index value is indicative of worsening heart failure of the patient; detect worsening heart failure in the patient when the index value is greater than an upper threshold of a threshold zone, the upper threshold and a lower threshold defining the threshold zone; determine whether worsening heart failure is detected in the patient based on the secondary diagnostic parameter when the index value is within the threshold zone; and adjust the threshold zone.
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25. A system comprising:
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means for monitoring at least one primary diagnostic parameter and at least one secondary diagnostic parameter of a patient; means for changing an index value over time based on the primary diagnostic parameter, wherein the index value is indicative of worsening heart failure of the patient; means for detecting worsening heart failure in the patient when the index value is greater than an upper threshold of a threshold zone, the upper threshold and a lower threshold defining the threshold zone; means for determining whether worsening heart failure is detected in the patient based on the secondary diagnostic parameter when the index value is within the threshold zone; and means for adjusting the threshold zone.
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26. An implantable medical device comprising:
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at least one sensor; and one or more processors configured to; monitor at least one primary diagnostic parameter and at least one secondary diagnostic parameter of a patient based on at least one signal from the at least one sensor; change an index value over time based on the primary diagnostic parameter, wherein the index value is indicative of worsening heart failure of the patient; detect worsening heart failure in the patient when the index value is greater than an upper threshold of a threshold zone, the upper threshold and a lower threshold defining the threshold zone; and determine whether worsening heart failure is detected in the patient based on the secondary diagnostic parameter when the index value is within the threshold zone.
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Specification