Method and apparatus for improving the accuracy of interpretation of ECG-signals
First Claim
1. An electrocardiographic ("ECG") method comprising:
- (A) determining an ECG signal for a subject;
(B) determining the position of the subject; and
(C) adjusting the ECG signal based on the determined subject'"'"'s position.
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Accused Products
Abstract
An electrocardiographic measurement system, method and device uses a device such as an inclinometer, which measures the body position in three orthogonal planes x, y and z in order to correct the calculated vector for changes in ECG parameters, especially S-T segment level during ischemic attacks. Recordings are made with a sixteen channel recorder for twenty four hours and so it is necessary to have a measure of the posture of the subject to interpret the ECG. An inclinometer, which measures gravitational acceleration in all planes to the nearest degree is used, giving three traces for the three planes x, y and z. By initial calibration of the ECG changes due to body position or continuous running average the calculated vector of the ECG can be corrected by standard geometric methods.
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Citations
23 Claims
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1. An electrocardiographic ("ECG") method comprising:
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(A) determining an ECG signal for a subject; (B) determining the position of the subject; and (C) adjusting the ECG signal based on the determined subject'"'"'s position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electrocardiographic ("ECG") method comprising:
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attaching an inclinometer to a subject in order to determine the position of the subject'"'"'s rib cage with reference to the earth'"'"'s gravitational field; providing a digital recorder capable of continuously recording the subject'"'"'s ECG measurements and of simultaneously continuously recording signals from the inclinometer; placing on the subject electrodes connected to the recorder; continuously recording the subject'"'"'s ECG measurements from the electrodes and simultaneously continuously recording signals from the inclinometer. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus for simultaneous recording of electrocardiograph signals and position signals of a subject, the apparatus comprising:
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an inclinometer; a first group of input channels for recording electrocardiograph signals so as to accurately determining the vector axis of the electrical activity of the heart; and a second group of input channels for storing position signals from the inclinometer; a memory for simultaneously storing the recorded electrocardiographic signals and the corresponding recorded position signals. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An electrocardiographic system comprising:
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(A) memory storing ECG signals and corresponding position signals; and (B) a processor programmed to; obtain an ECG signal and a corresponding position signal from the memory; determine an ECG vector corresponding to the obtained ECG signal; determine a position vector from the obtained corresponding position signal; determine a correction vector corresponding to the position vector; and adjust the ECG vector based on the determined ECG vector and the correction vector. - View Dependent Claims (21, 22)
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23. An electrocardiographic ("ECG") method for improving the accuracy of measured ECG signals of a subject, the method comprising:
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calibrating a database to store ECG signal correction factors by determining a standard ECG signal and a standard body position corresponding thereto based upon an ECG measurement and body position measurement taken when the subject is in a standard position, and variant ECG signals and variant body position measurements corresponding thereto based upon ECG measurements and body position measurements taken when the subject is in positions other than the standard position; determining a current ECG signal for the subject; determining a current body position of the subject; and using the stored ECG correction factors in the database to adjust the current ECG signal based upon the current body position of the subject.
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Specification