Respiration monitor including cardio-vascular artifact...

Details Respiration monitor including cardio-vascular artifact... Respiration monitor including cardio-vascular artifact...

A - Human Necessities

61

B

326/13.6

A61B 5/05 (2006.01) A61B 5/08 (2006.01)

Patent

CA 1158320

-12- RESPIRATION MONITOR INCLUDING CARDIO-VASCULAR ARTIFACT DETECTION Abstract A respiration monitor for measuring the varia- tions of the thorax impedance of a patient due to respiration is described. The monitor includes cir- cuitry for suppressing the indication of unwanted sig- nals caused by cardio-vascular activity of the patient. The circuitry receives trigger signals im- mediately following the QRS complex of the patient's ECG waveform. If a certain negative-going slope is detected in the thorax impedance waveform following the QRS complex, it is counted as a cardio-vascular artifact and not respiration activity. After a pre- determined number of cardio-vascular artifact are de- tected and counted, the respiration monitor is dis- abled so that this cardio-vascular activity will not reset an apnea counter.

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