System and Method to Monitor Ejection Time and QT Interval to Alert Patients Before Syncopal Events
First Claim
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1. A method for predicting syncope for use in an implantable medical device, comprising:
- sensing a physiological signal;
determining a time interval corresponding to cardiac ejection time from the physiological signal;
detecting a change in the time interval;
predicting syncope in response to the detected change; and
generating a patient alert in response to the predicted syncope.
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Abstract
An implantable medical device and associated method predict syncope based on detecting a change in ejection time. A physiological signal is sensed that is responsive to mechanical changes associated with the cardiac ejection phase. A time interval corresponding to cardiac ejection time is detected from the physiological signal. A sudden change in the time interval is used as a predictor of syncope and causes a patient alert to be generated in response to the detected change.
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Citations
23 Claims
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1. A method for predicting syncope for use in an implantable medical device, comprising:
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sensing a physiological signal; determining a time interval corresponding to cardiac ejection time from the physiological signal; detecting a change in the time interval; predicting syncope in response to the detected change; and generating a patient alert in response to the predicted syncope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device system for predicting syncope, comprising:
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a sensor for sensing a physiological signal; a processor configured to receive the sensor signal, determine a time interval corresponding to a cardiac ejection time from the physiological signal, detect a change in the time interval, and predict syncope in response to the detected change in the time interval; and a patient alert module for generating a patient alert in response to the predicted syncope. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A computer readable medium for storing a set of instructions for predicting syncope, which, when implemented in an implantable medical device system, cause the system to:
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sense a physiological signal; detect a time interval corresponding to cardiac ejection time from the physiological signal; detect a change in the time interval; predict syncope in response to the changed time interval; and generate a patient alert in response to the predicted syncope.
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Specification