APPARATUS AND METHOD FOR IDENTIFYING ATRIAL ARRHYTHMIA BY FAR-FIELD SENSING
First Claim
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1. A method of treating a patient comprising:
- implanting a cardioverter-defibrillator in the patient;
capturing far-field cardiac signals from electrodes disposed beneath the skin and outside of a patient'"'"'s ribcage;
identifying the patient'"'"'s P-wave in the far-field cardiac signals;
monitoring the patient'"'"'s P-wave to determine whether the patient'"'"'s P-wave abruptly changes; and
if the patient'"'"'s P-wave abruptly changes, determining that the patient is experiencing atrial fibrillation and withholding cardiac stimulus that would otherwise be delivered to the patient.
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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
1 Claim
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1. A method of treating a patient comprising:
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implanting a cardioverter-defibrillator in the patient; capturing far-field cardiac signals from electrodes disposed beneath the skin and outside of a patient'"'"'s ribcage; identifying the patient'"'"'s P-wave in the far-field cardiac signals; monitoring the patient'"'"'s P-wave to determine whether the patient'"'"'s P-wave abruptly changes; and if the patient'"'"'s P-wave abruptly changes, determining that the patient is experiencing atrial fibrillation and withholding cardiac stimulus that would otherwise be delivered to the patient.
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Specification