Implantable syncope monitor and method of using the same
First Claim
1. A method of monitoring physiological signals comprising:
- acquiring at least a first and a second physiological signals;
if the first physiological signal represents a blood pressure trigger event, determining a direction of change of the trigger event;
if the direction of change of the trigger event represents a decrease in blood pressure, analyzing the second physiological signal to determine if a heart rate has changed since the decrease in blood pressure; and
confirming a likelihood of vasovagal syncope if the heart rate does not increase.
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Accused Products
Abstract
An implantable monitor and method to acquire, store, and display physiological data for the diagnosis of vasovagal syncope or intermittent cardiac arrhythmias. Physiological data monitored preferably comprises heart rate, blood pressure, and body posture. Physiological signals are monitored until detection of an event that triggers the storage of data. A storage-triggering event may be a maximum or minimum heart rate or blood pressure, a dramatic change in heart rate or blood pressure, or a patient-activated signal. In one embodiment, confirmed detection of vasovagal syncope by the monitor causes a telemetric command to enable a syncope therapy. Storage of physiologic data is triggered by predetermined arrhythmia or syncope detection criteria and appropriate stimulation therapy for the detected condition may be enabled.
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Citations
30 Claims
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1. A method of monitoring physiological signals comprising:
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acquiring at least a first and a second physiological signals;
if the first physiological signal represents a blood pressure trigger event, determining a direction of change of the trigger event;
if the direction of change of the trigger event represents a decrease in blood pressure, analyzing the second physiological signal to determine if a heart rate has changed since the decrease in blood pressure; and
confirming a likelihood of vasovagal syncope if the heart rate does not increase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device for monitoring physiological signals comprising:
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a plurality of sensors that acquire first and second physiological signals;
a detector connected to at least one of the sensors, wherein the detector is operative to detect if the first physiological signal represents a blood pressure trigger event, and to determine a direction of change of the trigger event;
a control circuit that analyzes the second physiological signal to determine if a heart rate has changed if the direction of change of the trigger event represents a decrease in blood pressure, wherein the circuit determines a potential vasovagal syncope condition exists if the heart rate has not increased. - View Dependent Claims (20, 21, 22, 23, 24)
a maximum heart rate;
a minimum heart rate; and
a predetermined change in the heart rate.
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24. The device of claim 19, wherein the control circuit analyzes the first physiological signal by analyzing any one of:
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a maximum blood pressure;
a minimum blood pressure; and
a predetermined change in blood pressure.
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25. A cardiac stimulation device capable of monitoring physiological signals, the device comprising:
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means for detecting a blood pressure decrease;
means for determining if a heart rate changes subsequent to the detected blood pressure decrease; and
means for determining that a potential vasovagal syncope condition exists if the heart rate does not increase. - View Dependent Claims (26, 27, 28, 29, 30)
a maximum heart rate;
a minimum heart rate; and
a predetermined change in the heart rate.
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30. The device of claim 25, wherein the control circuit analyzes the first physiological signal by analyzing any one of:
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a maximum blood pressure;
a minimum blood pressure; and
a predetermined change in blood pressure.
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Specification