System and method for detecting hypoglycemia using an implantable medical device based on pre-symptomatic physiological responses
First Claim
1. A method for use with an implantable medical device for detecting hypoglycemia within a patient in which the device is implanted, said method comprising:
- sensing an electrical cardiac signal;
deriving values representative of a pre-symptomatic physiologic response to a hypoglycemic event from the cardiac signal by deriving temporal morphological parameters within the cardiac signal that are affected by pre-symptomatic hypoglycemia and deriving spectral parameters from the cardiac signal that are affected by pre-symptomatic hypoglycemia; and
detecting hypoglycemia based on the values representative of the pre-symptomatic physiologic response.
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Abstract
An intracardiac electrogram (IEGM) or other suitable electrical cardiac signal is sensed. Values representative of a pre-symptomatic physiologic response to a hypoglycemic event are derived from the cardiac signal. Then, hypoglycemia is detected based on the values representative of the pre-symptomatic physiologic response. In one example, both temporal morphological parameters and spectral parameters affected by pre-symptomatic hypoglycemia are derived from the cardiac signal. Hypoglycemia is then detected based on a combination of the temporal and spectral parameters using, e.g., a linear discriminator. By detecting hypoglycemia based on parameters affected by pre-symptomatic hypoglycemia, suitable warnings can be generated and therapies initiated before the condition becomes symptomatic.
82 Citations
27 Claims
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1. A method for use with an implantable medical device for detecting hypoglycemia within a patient in which the device is implanted, said method comprising:
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sensing an electrical cardiac signal; deriving values representative of a pre-symptomatic physiologic response to a hypoglycemic event from the cardiac signal by deriving temporal morphological parameters within the cardiac signal that are affected by pre-symptomatic hypoglycemia and deriving spectral parameters from the cardiac signal that are affected by pre-symptomatic hypoglycemia; and detecting hypoglycemia based on the values representative of the pre-symptomatic physiologic response. - 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, 24, 25)
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26. A system for use with an implantable medical device for detecting hypoglycemia within a patient in which the device is implanted, said system comprising:
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an electrical cardiac signal detector operative to detect an electrical cardiac signal within the patient; a pre-symptomatic physiologic response detector operative to derive values representative of a pre-symptomatic physiologic response to a hypoglycemic event from the cardiac signal by deriving temporal morphological parameters within the cardiac signal that are affected by pre-symptomatic hypoglycemia and deriving spectral parameters from the cardiac signal that are affected by pre-symptomatic hypoglycemia; and a hypoglycemia detector operative to detect hypoglycemia based on the values representative of a pre-symptomatic physiologic response to a hypoglycemic event.
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27. A system for use with an implantable medical device for detecting hypoglycemia within a patient in which the device is implanted, said system comprising:
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means for detecting an electrical cardiac signal within the patient; means for deriving values representative of a pre-symptomatic physiologic response to a hypoglycemic event from the cardiac signal by deriving temporal morphological parameters within the cardiac signal that are affected by pre-symptomatic hypoglycemia and deriving spectral parameters from the cardiac signal that are affected by pre-symptomatic hypoglycemia; and means for detecting hypoglycemia based on the values representative of a pre-symptomatic physiologic response to a hypoglycemic event.
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Specification