Autonomic nervous system testing by bi-variate spectral analysis of heart period and QT interval variability
First Claim
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1. A method for testing the autonomic nervous system of a mammal, comprising the steps of:
- obtaining electrocardiographic (ECG) data from said mammal under a selectable state of autonomic stimulation for a predetermined period of time;
calculating heart period (RR) intervals and QT intervals for a predetermined number of heart beats represented in said ECG data, and outputting the calculated RR and QT intervals in the form of electrical data signals;
calculating power spectral densities of said RR and QT intervals; and
analyzing the calculated RR and QT interval power spectral densities with respect to each other as an indication of the state of balance between parasympathetic and sympathetic controls of the autonomic nervous system of said mammal.
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Abstract
Apparatus and method for testing the autonomic nervous system of a mammal through bi-variate analysis of heart period (RR) and QT interval variability obtained through data processing of electrocardiographic data. The method and apparatus enables both the parasympathetic and sympathetic controls on the heart to be evaluated for imbalances therebetween, which may indicate a predisposition for sudden cardiac death.
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Citations
18 Claims
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1. A method for testing the autonomic nervous system of a mammal, comprising the steps of:
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obtaining electrocardiographic (ECG) data from said mammal under a selectable state of autonomic stimulation for a predetermined period of time; calculating heart period (RR) intervals and QT intervals for a predetermined number of heart beats represented in said ECG data, and outputting the calculated RR and QT intervals in the form of electrical data signals; calculating power spectral densities of said RR and QT intervals; and analyzing the calculated RR and QT interval power spectral densities with respect to each other as an indication of the state of balance between parasympathetic and sympathetic controls of the autonomic nervous system of said mammal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for testing the autonomic nervous system of a mammal, comprising the steps of:
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obtaining electrocardiographic (ECG) data from said mammal under a selectable state of autonomic stimulation for a predetermined period of time; calculating heart period (RR) intervals and QT intervals for a predetermined number of heart beats represented in said ECG data, and outputting the calculated RR and QT intervals in the form of electrical data signals; and analyzing the calculated RR and QT intervals with respect to each other as an indication of the state of balance between parasympathetic and sympathetic controls of the autonomic nervous system of said mammal. - View Dependent Claims (7, 8, 9)
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10. Apparatus for testing the autonomic nervous system of a mammal, comprising:
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means for obtaining electrocardiographic (ECG) data from said mammal under a selectable state of autonomic stimulation for a predetermined period of time; means for calculating heart period (RR) intervals and QT intervals for a predetermined number of heart beats represented in said ECG data, and for outputting the calculated RR and QT intervals in the form of electrical data signals; means for calculating power spectral densities of said RR and QT intervals; and means for analyzing the calculated RR and QT interval power spectral densities with respect to each other as an indication of the state of balance between parasympathetic and sympathetic controls of the autonomic nervous system of said mammal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification