ISO-volumetric method of measuring carbon dioxide elimination
First Claim
1. A method of determining a carbon dioxide elimination (VCO2) of a patient, comprising:
- sensing a flow of respiration of the patient over at least a portion of at least one breath;
sensing a carbon dioxide fraction (ƒ
) of said respiration over said at least a portion;
selecting a tidal volume (Vt) not equal to at least one of an inspiratory tidal volume (Vi) and an expiratory tidal volume (Ve) of the patient; and
calculating the carbon dioxide elimination with said flow, said carbon dioxide fraction, and said selected tidal volume.
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Abstract
A method of calculating the carbon dioxide elimination of a patient that includes counteracting any inaccuracy or inconsistency in respiratory flow measurements that may be caused by "noise", such as is attributable to respiratory circuit leaks, signal drift, a non-unity respiratory quotient, or another respiratory flow error-inducing factor. The method includes monitoring the respiratory flow and carbon dioxide of the patient during at least a portion of both inspiration and expiration; calculating an inspiratory tidal volume, an inspiratory volume averaged carbon dioxide fraction, an expiratory tidal volume, and an expiratory volume averaged carbon dioxide fraction; and selecting a tidal volume to replace at least one of the inspiratory tidal volume and the expiratory tidal volume. The carbon dioxide elimination of the patient is then calculated with the select tidal volume, the inspiratory volume averaged carbon dioxide fraction, and the expiratory volume averaged carbon dioxide fraction.
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Citations
20 Claims
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1. A method of determining a carbon dioxide elimination (VCO2) of a patient, comprising:
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sensing a flow of respiration of the patient over at least a portion of at least one breath; sensing a carbon dioxide fraction (ƒ
) of said respiration over said at least a portion;selecting a tidal volume (Vt) not equal to at least one of an inspiratory tidal volume (Vi) and an expiratory tidal volume (Ve) of the patient; and calculating the carbon dioxide elimination with said flow, said carbon dioxide fraction, and said selected tidal volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of calculating a carbon dioxide elimination (VCO2) of a patient, comprising:
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obtaining a plurality of inspiratory flow signals of the patient; obtaining a plurality of expiratory flow signals of the patient; selecting a select tidal volume (Vt) based at least in part on one of an inspiratory tidal volume (Vi) and an expiratory tidal volume (Ve); and calculating the carbon dioxide elimination with said plurality of inspiratory flow signals, said plurality of expiratory flow signals, and said select tidal volume. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification