Pace pulse eliminator
First Claim
1. A method for eliminating a pace pulse from an EKG wave comprising the steps ofderiving an indication of the point in the ECG wave where a pace pulse occurs,deriving interpolations of values of said ECG wave that are on either side of said point, andsubstituting said interpolations for a portion of said wave including said point.
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Accused Products
Abstract
Apparatus for effectively eliminating pace pulses from an ECG wave without introducing distortion comprising means for comparing the slope of the ECG wave with a threshold slope derived from the wave that is greater than the maximum slope produced in the wave by heart action and substituting values for a portion of the wave between first and second points on either side of the place in the wave where its slope exceeds the threshold value, the substituted values being interpolations of the value of the ECG wave occurring at said points. In a preferred embodiment means are provided for preventing the substitution from occurring unless a pace pulse is detected within a given distance of the said place in the ECG wave and means are also provided for setting said first point at a place in the ECG wave that occurs prior to a tail that precedes it. '"'"'
45 Citations
9 Claims
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1. A method for eliminating a pace pulse from an EKG wave comprising the steps of
deriving an indication of the point in the ECG wave where a pace pulse occurs, deriving interpolations of values of said ECG wave that are on either side of said point, and substituting said interpolations for a portion of said wave including said point.
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2. An apparatus for eliminating a pace pulse signal from and ECG wave signal comprising,
a terminal to which an ECG wave signal can be applied, a memory means coupled to said terminal for storing said ECG wave signal, means coupled to said terminal for providing an indication of the time of occurrence of a pace signal in said ECG wave signal applied to the terminal, examining means responsive to said indicating means for examining the ECG wave stored in said memory means to determine its amplitudes at predetermined times that respectively occur prior to and subsequent to said indicated time of occurrence, means coupled to said examining means for deriving interpolated values of said amplitudes, and means coupled to said memory means for substituting said interpolated values of values of the ECG wave signal in a time window in the ECG wave signal that includes said indicated time of occurrence of the pace pulse, whereby on ECG wave signal which is free of said pace pulse signal is provided.
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9. A system for increasing the reliance that can be placed on the detection of the pace pulses in an ECG wave signal comprising,
a terminal to which an ECG wave signal can be applied, a pulse detecting means coupled to said terminal, means coupled to said terminal for providing a first signal representative of the slope of said ECG wave signal. a QRS detecting means coupled to said terminal, means coupled to said QRS detecting means for providing a second signal indicative of an estimate of the maximum slope that can be produced by heart action in said ECG wave signal applied to said terminal, a comparison means having one input coupled to receive said first signal, its other input coupled to receive said second signal, and an output, and verifying means coupled to the output of said comparing means and to said pace pulse detecting means, said verifying means providing an indication that a pace pulse has occurred when the following events occur within a given time window: - the output of said comparison means indicates that the slope of said ECG wave signal exceeds said maximum slope and said pace pulse detecting means indicates that a pace pulse signal has occurred.
Specification