Ischemia detection systems for paced-patients using beat-type dependent baseline datasets
First Claim
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1. An implantable device with ischemia detection and heart pacing capability, including:
- at least one electrode adapted for implantation in a body;
circuitry coupled to the electrode to sense signals therefrom and to generate corresponding digital signals;
pacemaker circuitry;
a processor configured to;
distinguish between at least two beat types, including ventricularly paced and supraventricular beats;
collect data from the digital signals for the ventricularly paced and the supraventricular beats within a plurality of heart beat segments;
derive a ventricularly paced baseline for use with the ventricularly paced beats and a supraventricular baseline for use with the supraventricular beats, wherein the ventricularly paced baseline and the supraventricular baseline are indicative of a normal value of a heart signal parameter over a period of at least one hour defining a first time interval;
(a) determine whether a current beat during a second time interval is supraventricular or paced, thereby establishing a current beat type;
(b) determine whether the baseline corresponding to the current beat type is valid for the second time interval;
(c) when the corresponding baseline in said first time interval is valid for said second time interval, apply predetermined ischemia criteria based on the corresponding baseline to the current beat;
(d) when the corresponding baseline is invalid for said second time interval, apply ischemia criteria selected from the group of;
collecting a plurality of the current beat type over a predetermined time interval;
apply a time rate of change of a heart rate feature over said predetermined time interval;
or apply the baseline in said first time interval with a correction factor over said second time interval.
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Abstract
A device for detecting cardiac ischemia is disclosed. The device includes a processor that is configured to distinguish between two different heart beats types such as ventricularly paced beats and supraventricular beats. The processor collects separate reference data for each beat type indicative of the normal values of a cardiac feature associated with these beat types. The processor performs an ischemia test by separately comparing present values of the cardiac feature for each beat type with the reference values for the corresponding beat type.
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Citations
13 Claims
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1. An implantable device with ischemia detection and heart pacing capability, including:
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at least one electrode adapted for implantation in a body; circuitry coupled to the electrode to sense signals therefrom and to generate corresponding digital signals; pacemaker circuitry; a processor configured to; distinguish between at least two beat types, including ventricularly paced and supraventricular beats; collect data from the digital signals for the ventricularly paced and the supraventricular beats within a plurality of heart beat segments; derive a ventricularly paced baseline for use with the ventricularly paced beats and a supraventricular baseline for use with the supraventricular beats, wherein the ventricularly paced baseline and the supraventricular baseline are indicative of a normal value of a heart signal parameter over a period of at least one hour defining a first time interval; (a) determine whether a current beat during a second time interval is supraventricular or paced, thereby establishing a current beat type; (b) determine whether the baseline corresponding to the current beat type is valid for the second time interval; (c) when the corresponding baseline in said first time interval is valid for said second time interval, apply predetermined ischemia criteria based on the corresponding baseline to the current beat; (d) when the corresponding baseline is invalid for said second time interval, apply ischemia criteria selected from the group of;
collecting a plurality of the current beat type over a predetermined time interval;
apply a time rate of change of a heart rate feature over said predetermined time interval;
or apply the baseline in said first time interval with a correction factor over said second time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification