Apparatus and method of arrhythmia detection in a subcutaneous implantable cardioverter/defibrillator
First Claim
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1. A method of monitoring cardiac function of a patient in an implantable cardiac treatment system, the method comprising:
- obtaining a cardiac rate for the patient from subcutaneous electrodes spaced apart and subcutaneously implanted in the patient;
determining whether the cardiac rate;
(a) exceeds a first threshold but does not exceed a second threshold;
or;
(b) exceeds the second threshold;
and;
if the cardiac rate exceeds the second threshold, directing therapy to the heart;
orif the cardiac rate exceeds the first threshold but does not exceed the second threshold, directing further analysis to determine whether therapy is indicated.
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Abstract
In a subcutaneous implantable cardioverter/defibrillator, cardiac arrhythmias are detected to determine necessary therapeutic action. Cardiac signal information is sensed from far field electrodes implanted in a patient. The sensed cardiac signal information is then amplified and filtered. Parameters such as rate, QRS pulse width, cardiac QRS slew rate, amplitude and stability measures of these parameters from the filtered cardiac signal information are measured, processed and integrated to determine if the cardioverter/defibrillator needs to initiate therapeutic action.
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Citations
15 Claims
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1. A method of monitoring cardiac function of a patient in an implantable cardiac treatment system, the method comprising:
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obtaining a cardiac rate for the patient from subcutaneous electrodes spaced apart and subcutaneously implanted in the patient; determining whether the cardiac rate; (a) exceeds a first threshold but does not exceed a second threshold;
or;(b) exceeds the second threshold; and; if the cardiac rate exceeds the second threshold, directing therapy to the heart;
orif the cardiac rate exceeds the first threshold but does not exceed the second threshold, directing further analysis to determine whether therapy is indicated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating an implantable cardiac treatment system, the method comprising:
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obtaining a cardiac rate for a patient using two implanted electrodes disposed outside of the heart and vasculature of the patient; determining whether the cardiac rate; (a) exceeds a first threshold but does not exceed a second threshold;
or;(b) exceeds the second threshold; and; if the cardiac rate exceeds the second threshold, directing therapy to the heart;
orif the cardiac rate exceeds the first threshold but does not exceed the second threshold, directing further analysis to determine whether therapy is indicated. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification