Variable threshold R-wave detector
First Claim
1. An improved R-wave detector comprising means responsive to a continuous ECG waveform having a series of R-waves therein for providing a value representative of the peak height of at least one R-wave in an immediately preceding limited plurality of R-waves, automatically variable scaling means for scaling one of the instant said ECG waveform and said peak height representing value to be a controllably variable percentage of the other, means for comparing said scaled one of the instant said ECG waveform and said peak height representing value with the other and providing a signal indicative of R-wave occurrence when the instant ECG waveform-based signal exceeds the peak height representing value based-signal;
- and means responsive to a said signal indicative of R-wave occurrence for automatically varying said scaling percentage of said variable scaling means.
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Abstract
An improved R-wave detector is provided for use in monitoring and/or analyzing electrical heart waveforms. Generally conventional R-wave detection means employ automatically variable scaling means for providing a threshold or reference value to a comparator which is variable not only in magnitude but also as a percentage of the average R-wave peak value from which it is derived. An ECG waveform is compared with this threshold of automatically variable percentage value and an indication of R-wave occurrence is provided when the ECG waveform exceeds the threshold. Upon an indication of R-wave occurrence, the percentage value of the threshold is rapidly increased such that a closely following T-wave of unusually large magnitude is not falsely detected as an R-wave. Then, following the interval during which a T-wave might occur and before the possible occurrence of even a premature following R-wave, the percentage value of the threshold decreases to a level capable of detecting even such premature R-waves of reduced amplitude.
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7 Claims
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1. An improved R-wave detector comprising means responsive to a continuous ECG waveform having a series of R-waves therein for providing a value representative of the peak height of at least one R-wave in an immediately preceding limited plurality of R-waves, automatically variable scaling means for scaling one of the instant said ECG waveform and said peak height representing value to be a controllably variable percentage of the other, means for comparing said scaled one of the instant said ECG waveform and said peak height representing value with the other and providing a signal indicative of R-wave occurrence when the instant ECG waveform-based signal exceeds the peak height representing value based-signal;
- and means responsive to a said signal indicative of R-wave occurrence for automatically varying said scaling percentage of said variable scaling means.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification