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Autonomic nervous system testing by bi-variate spectral analysis of heart period and QT interval variability

  • US 5,419,338 A
  • Filed: 02/22/1994
  • Issued: 05/30/1995
  • Est. Priority Date: 02/22/1994
  • Status: Expired due to Term
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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