ALARM SYSTEMS USING MONITORED PHYSIOLOGICAL DATA AND TREND DIFFERENCE METHODS
First Claim
1. method of detecting a hypoglycaemic state in a patient, the method comprising:
- monitoring a heart rate of the patient to provide a heart-rate signal;
determining a time-lagged time sequence as the difference between the heart-rate signal and a time-lagged version of the heart-rate signal;
inferring the occurrence of a hypoglycaemic event if the difference exceeds a first specified threshold andissuing an alarm if the occurrence is inferred.
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Abstract
A method and system are described for detecting a hypoglycaemic state in a patient. The patient'"'"'s heart rate is monitored to provide a heart-rate signal. A time-lagged signal is determined as the difference between the heart-rate signal and a time-lagged version of the heart rate-signal. The heart-rate signal is filtered with a low-pass filter to provide a heart-rate trend. An absolute difference between the heart-rate signal and the heart-rate trend is determined to provide an absolute-difference signal. A second time-lagged signal is determined as a difference between the absolute-difference signal and a time-lagged version of the absolute-difference signal. The occurrence of a hypoglycaemic condition is inferred dependent on the time-lagged signal and the second time-lagged signal.
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Citations
21 Claims
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1. method of detecting a hypoglycaemic state in a patient, the method comprising:
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monitoring a heart rate of the patient to provide a heart-rate signal; determining a time-lagged time sequence as the difference between the heart-rate signal and a time-lagged version of the heart-rate signal; inferring the occurrence of a hypoglycaemic event if the difference exceeds a first specified threshold and issuing an alarm if the occurrence is inferred. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 19, 20)
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9. A method of detecting a hypoglycaemic state in a patient, the method. comprising:
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monitoring, a heart rate of the patient to provide a heart-rate signal; filtering the heart-rate signal with a low-pass filter to provide a heart-rate trend; determining an absolute difference between the heart-rate signal and the heart-rate trend to provide an absolute-difference time sequence; and generating a time-lagged signal as a difference between the absolute-difference time sequence and a time-lagged version of the absolute-difference time sequence. - View Dependent Claims (10)
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11. A method of detecting a hypoglycaemic state in a patient, the method comprising:
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monitoring a heart rate of the patient to provide a heart-rate signal; determining a time-lagged signal as the difference between the heart-rate signal and a time-lagged version of the heart rate-signal; filtering the heart-rate signal with a low-pass filter to provide a heart-rate trend; determining an absolute difference between the heart-rate signal and the heart-rate trend to provide an absolute-difference signal; generating a second time-lagged signal as a difference between the absolute-difference signal and a time-lagged version of the absolute-difference signal; and inferring the occurrence of a hypoglycaemic condition dependent on the time-lagged signal and the second time-lagged signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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21. (canceled)
Specification