Apparatus and method for identifying atrial arrhythmia by far-field sensing
First Claim
1. An implantable medical device (IMD) configured for monitoring a patient'"'"'s cardiac rhythm to determine whether an arrhythmia is occurring, the IMD comprising:
- a housing containing a battery and operational circuitry for the IMD; and
at least first and second electrodes on the housing and electrically coupled to the operational circuitry, the electrodes configured for sensing a cardiac signal of the patient;
wherein the operational circuitry is configured to detect one or more R-waves for the patient in a sensed cardiac signal from the electrodes and observe whether intervals between consecutive R-waves are consistent or inconsistent;
wherein the operational circuitry is configured to also observe whether a P-wave is present for the patient; and
wherein the operational circuitry is configured to determine that the patient has an atrial arrhythmia in response to determining that the intervals between consecutive R-waves are inconsistent and the P-wave is absent.
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Accused Products
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.
338 Citations
14 Claims
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1. An implantable medical device (IMD) configured for monitoring a patient'"'"'s cardiac rhythm to determine whether an arrhythmia is occurring, the IMD comprising:
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a housing containing a battery and operational circuitry for the IMD; and at least first and second electrodes on the housing and electrically coupled to the operational circuitry, the electrodes configured for sensing a cardiac signal of the patient; wherein the operational circuitry is configured to detect one or more R-waves for the patient in a sensed cardiac signal from the electrodes and observe whether intervals between consecutive R-waves are consistent or inconsistent; wherein the operational circuitry is configured to also observe whether a P-wave is present for the patient; and wherein the operational circuitry is configured to determine that the patient has an atrial arrhythmia in response to determining that the intervals between consecutive R-waves are inconsistent and the P-wave is absent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification