Method and apparatus for monitoring respiration
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United States of America Patent
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-
Jul 19, 1988
Grant Date -
N/A
app pub date -
Aug 15, 1986
filing date -
Aug 21, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and an apparatus are provided for monitoring waveforms representing the respiration of a patient and for detecting waveforms having characteristics indicative of apnea. The method comprises processing a first electrical signal having a waveform representing the respiration of the patient and a second electrical signal representing the electrocardiogram of the patient. In order to increase the reliability of apnea alarms and the accuracy of measuring apnea duration, the method comprises: comparing the amplitude of the first signal, or the amplitude of a signal obtained by transformation of the first signal, at the time of incidence of each QRS complex with a predetermined threshold value, resetting to zero the first signal or said signal obtained by transformation of the first signal in synchronism with the incidence of each QRS complex on the second signal, and triggering an alarm if the amplitudes of the first signal, or of said signal obtained by transformation thereof, at the said times do not exceed the threshold value over a predetermined interval of time, said alarm being indicative of apnea.
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