Systems and Methods for Use with an Implantable Medical Device for Detecting Stroke Based on Electrocardiac Signals
First Claim
1. A method for use with an implantable medical device for implant within a patient, the method comprising:
- sensing electrocardiac signals using the implantable device;
detecting an indication of stroke within the patient based on predetermined changes in the electrocardiac signal; and
controlling at least one device function in response the indication of the stroke.
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Accused Products
Abstract
Techniques are provided for detecting stroke within a patient using an implantable medical device in conjunction with an external confirmation system. In one example, a preliminary detection of stroke is performed by a subcutaneous monitor based on an analysis of features of an electrocardiogram (ECG) sensed within the patient. Exemplary ECG features indicative of possible stroke include the onset of prominent U-waves, the onset of notched T-waves, and changes in ST segment duration or QT duration or dynamic trends in these parameters. The monitor transmits a signal indicative of possible stroke to a bedside monitor or other external system, which generates a stroke questionnaire for use in confirming the stroke. Family members or other caregivers input answers to the questionnaire into the external system, which confirms or disconfirms the stroke. Emergency personnel can be automatically notified. Implantable systems that detect stroke based on intracardiac electrogram (IEGM) signals are also described herein.
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Citations
20 Claims
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1. A method for use with an implantable medical device for implant within a patient, the method comprising:
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sensing electrocardiac signals using the implantable device; detecting an indication of stroke within the patient based on predetermined changes in the electrocardiac signal; and controlling at least one device function in response the indication of the stroke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for use with an implantable medical device for implant within a patient, along with an external system, the method comprising:
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sensing electrocardiac signals using the implantable device; detecting an indication of stroke within the patient using the implantable device based on predetermined changes in the electrocardiac signal indicative of stroke; transmitting a signal indicative of a possible stroke from the implantable device to the external system; generating a questionnaire using the external system for confirming the stroke within the patient; inputting answers to the questionnaire to confirm the stroke; and outputting a warning signal from the external system upon confirmation of a stroke within the patient.
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17. A system for use with an implantable medical device for implant within a patient, the system comprising:
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a electrocardiac signal sensing device for implant within the patient; and an on-board stroke detector within the implantable medical device and operative to detect an indication of stroke within the patient based on predetermined changes in the electrocardiac signals indicative of stroke. - View Dependent Claims (18)
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19. A medical system incorporating an implantable medical device and an external system, comprising:
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an electrocardiac signal sensing device within the implantable medical device; a preliminary stroke detector within the implantable medical device operative to detect a preliminary indication of stroke within the patient based on predetermined changes in the electrocardiac signals indicative of stroke; a transmitter within the implantable medical device operative to transmit a signal indicative of a possible stroke from the implantable device to the external system; and a stroke confirmation system within the external system operative to confirm the stroke within the patient.
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20. A system for use with an implantable medical device for implant within a patient, the system comprising:
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means for sensing electrocardiac signals using the implantable device; means for detecting an indication of stroke within the patient based on predetermined changes in the electrocardiac signal.
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Specification