Electrocardiographic means and method for detecting potential ventricular tachycardia
First Claim
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1. A method for analyzing electrocardiograph signals to determine the presence or absence of a predetermined level of high frequency energy in the late QRS signal, comprising the steps of:
- converting a series of QRS signals to time segments, each segment having a digital value equivalent to the analog value of said signals at said time;
applying a portion of said time segments in reverse time order to high pass filter means;
determining an arithmetic value of the amplitude of the output of said filter; and
comparing said value with said predetermined level.
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Abstract
The late portion of a post myocardial infarct patient'"'"'s QRS waveform contains a high frequency signal tail which is indicative of a tendency toward vertricular tachycardia. This invention digitally processes and filters a patient'"'"'s QRS signals in a reverse time manner to isolate the high frequency tail and avoid the filter ringing which would otherwise hide the signal.
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16 Claims
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1. A method for analyzing electrocardiograph signals to determine the presence or absence of a predetermined level of high frequency energy in the late QRS signal, comprising the steps of:
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converting a series of QRS signals to time segments, each segment having a digital value equivalent to the analog value of said signals at said time; applying a portion of said time segments in reverse time order to high pass filter means; determining an arithmetic value of the amplitude of the output of said filter; and comparing said value with said predetermined level. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for analyzing electrocardiograph signals to determine the level of high frequency energy in the late QRS signal comprising:
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means for converting X, Y, and Z lead electrocardiographic input signals to digital valued time segments; means for examining said X, Y, and Z digital valued time segments and selecting therefrom the QRS waveform portions thereof; means for signal averaging a multiplicity of said selected QRS waveforms for each of said X, Y, and Z inputs and providing composite, digital X, Y, and Z QRS waveforms; high pass filter means; means for applying to said filter means, in reverse time order, the anterior portion of each said digital X, Y, and Z waveform; and means for comparing the output of said filter means with a predetermined level to obtain an indication of the presence of a high frequency, low level, energy component in the filter output of said anterior portions. - View Dependent Claims (8, 9, 10, 11)
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12. Apparatus for analyzing electrocardiograph signals comprising:
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means for converting electrocardiographic input signals to digital QRS waveform segments; high pass filter means; means for applying to said filter means, in reverse time order, the anterior portion of each said digital QRS waveform; and means for comparing the output of said filter means with a predetermined level. - View Dependent Claims (16)
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- 13. The invention as defined in claim 13 wherein said means for comparing examines only a portion of said filter'"'"'s output.
Specification