Method and device for removing respiratory artefacts from measured blood pressure data
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Abstract
The invention relates to a method and a device for removing respiratory artefacts in invasive blood pressure measurements. The level of CO2 in the expired air is monitored during blood pressure measurement and used to approximate and remove the respiratory artifacts. In one embodiment, the respiratory frequency from the respiratory signal is extracted by identifying the end-tidal CO2 level for each breath. A model is derived for the respiratory artifacts using the respiratory frequency, and the model is subtracted from the measured blood pressure data.
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Citations
34 Claims
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1-15. -15. (canceled)
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16. A method for removing artefacts caused by patient respiration in measured blood pressure data acquired invasively in the heart or an artery of the patient, comprising:
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acquiring the level of CO2 in the patient'"'"'s expired air as a respiratory signal during the blood pressure measurement;
using the respiratory signal to approximate the artefacts caused by patient respiration; and
removing the artifacts based on the respiratory signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method for removing artefacts caused by patient respiration in measured blood pressure data, blood acquired invasively in the heart or an artery of the patient, comprising:
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decomposing the measured blood pressure data into several components by means of a wavelet transform, wherein a portion of the components containing largely the respiratory artefacts; and
processing and subtracting those components from the measured blood pressure data.
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31. A device for acquiring and correcting blood pressure data comprising:
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a catheter insertable into the heart or an artery for measuring blood pressure;
a sensor for measuring the level of CO2 in the patient'"'"'s expired air as a respiratory signal; and
a data processing module for removing artefacts in the measured blood pressure data, wherein the data processing module is adapted to use the respiratory signal to approximate and remove the artefacts caused by patient respiration. - View Dependent Claims (32, 33, 34)
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Specification