Method and apparatus for gauging cardiac status using post premature heart rate turbulence
First Claim
1. A method for quantifying heart rate turbulence of a patient that is automatically executable by a medical device, the method comprising the steps of:
- registering a cardiac perturbation characteristic with a sensing circuit of a medical device;
measuring a heart rate turbulence parameter resulting from the cardiac perturbation characteristic with a measuring circuit of the medical device; and
quantifying the heart rate turbulence parameter to determine a present hemodynamic status of a patient.
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Abstract
A hemodynamic status of a patient is determined in an implanted medical device (IMD) by observing a perturbation of the patient'"'"'s heart, measuring heart rate turbulence resulting from the perturbation, and quantifying the heart rate turbulence to determine the hemodynamic status. The perturbation may be naturally-occurring, or may be generated by the implantable medical device. The patient'"'"'s response to heart rate turbulence may also be used to provide a response to the patient, such as providing an alarm and/or administering a therapy. Heart rate turbulence may also be used to tune and/or optimize a device parameter such as A-V or V-V pacing intervals.
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Citations
40 Claims
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1. A method for quantifying heart rate turbulence of a patient that is automatically executable by a medical device, the method comprising the steps of:
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registering a cardiac perturbation characteristic with a sensing circuit of a medical device;
measuring a heart rate turbulence parameter resulting from the cardiac perturbation characteristic with a measuring circuit of the medical device; and
quantifying the heart rate turbulence parameter to determine a present hemodynamic status of a patient. - 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 medical device implanted in a patient, the device comprising:
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a data collection module configured to identify heart rate turbulence in the patient following a cardiac perturbation;
a data processing module in communication with the data collection module, wherein the data processing module is configured to correlate the heart rate turbulence to a hemodynamic status of the patient; and
a response module in communication with the data processing module, wherein the response module is configured to provide a response based upon the hemodynamic status. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A medical device implanted in a patient, the method comprising the steps of:
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means for observing a cardiac perturbation of the patient;
means for measuring heart rate turbulence resulting from the cardiac perturbation; and
means for quantifying the heart rate turbulence to determine a hemodynamic status of the patient. - View Dependent Claims (27, 28)
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29. A method of calibrating a parameter using an implantable medical device, the method comprising the steps of:
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providing a cardiac perturbation to a patient from the implantable medical device using an initial value of the parameter;
observing heart rate turbulence in the patient as a result of the cardiac perturbation;
adjusting a value of the parameter in response to the heart rate turbulence observed; and
repeating the adjusting and observing steps until a maximum amount of heart rate turbulence is observed in the patient. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification