Active medical device for monitoring the status of a patient suffering from a risk of heart failure
First Claim
1. A computerized method for evaluating heart status of a patient, comprising:
- using a microcontroller coupled to heart rate and endocardial acceleration sensors to calculate a hemodynamic parameter;
storing a plurality of heart rate and hemodynamic parameter pairs in bins, the bins grouped by heart rate, for both a long-term patient profile and a short-term patient profile;
calculating a difference between the long-term profile and the short-term profile for each bin and multiplying each resultant difference by a weight for the bin;
using the resulting products to calculate an index representative of the weighted difference between the long-term profile and the short-term profile; and
generating an output from a device using a determination based on the index.
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Abstract
An active medical device is configured to receive inputs and to calculate a hemodynamic parameter representative of myocardium contractility determined from an endocardial acceleration signal. The microcontroller acquires heart rate and hemodynamic parameter pairs of values during a plurality of cardiac cycles. The microcontroller is configured to distribute the pairs of values into discrete bins to develop a profile for analysis. The microcontroller is configured to conduct an analysis comprising calculating an index representative of the patient'"'"'s clinical status. The hemodynamic parameter representative of the myocardial contractility is a time interval separating the first and the second peak of endocardial acceleration.
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Citations
19 Claims
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1. A computerized method for evaluating heart status of a patient, comprising:
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using a microcontroller coupled to heart rate and endocardial acceleration sensors to calculate a hemodynamic parameter; storing a plurality of heart rate and hemodynamic parameter pairs in bins, the bins grouped by heart rate, for both a long-term patient profile and a short-term patient profile; calculating a difference between the long-term profile and the short-term profile for each bin and multiplying each resultant difference by a weight for the bin; using the resulting products to calculate an index representative of the weighted difference between the long-term profile and the short-term profile; and generating an output from a device using a determination based on the index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A computerized method for evaluating heart status of a patient, comprising:
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tracking a plurality of heart rate, hemodynamic parameter, and activity triplets for a patient using sensor readings; grouping the tracked triplets into at least three heart rate bins spanning at least three activity level bins; comparing short term performance within each activity to long term performance within each activity level, wherein the comparison comprises evaluating the bin-to-bin hemodynamic parameter changes within each activity level; and transmitting an alert from a device to a remote system based on the index. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification