Methods for accurately, substantially noninvasively determining pulmonary capillary blood flow, cardiac output, and mixed venous carbon dioxide content
A method for noninvasively determining the pulmonary capillary blood flow or cardiac output of a patient includes measurement of respiratory flow and carbon dioxide pressure of the patient's breathing. These measurements are used to calculate carbon dioxide elimination and an indicator of the c...
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Format | Patent |
Language | English |
Published |
11.04.2006
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Abstract | A method for noninvasively determining the pulmonary capillary blood flow or cardiac output of a patient includes measurement of respiratory flow and carbon dioxide pressure of the patient's breathing. These measurements are used to calculate carbon dioxide elimination and an indicator of the carbon dioxide content of the patient's blood. A geometric relationship between the carbon dioxide elimination data and the data of the indicator of carbon dioxide content is determined. At least one set of the data is modified and at least one other determination of a geometric relationship between the data is made to find the most accurate data set. The data may be modified by filtering or clustering. A slope of at least a portion of the geometric relationship is then used to determine the pulmonary capillary blood flow or cardiac output of the patient. |
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AbstractList | A method for noninvasively determining the pulmonary capillary blood flow or cardiac output of a patient includes measurement of respiratory flow and carbon dioxide pressure of the patient's breathing. These measurements are used to calculate carbon dioxide elimination and an indicator of the carbon dioxide content of the patient's blood. A geometric relationship between the carbon dioxide elimination data and the data of the indicator of carbon dioxide content is determined. At least one set of the data is modified and at least one other determination of a geometric relationship between the data is made to find the most accurate data set. The data may be modified by filtering or clustering. A slope of at least a portion of the geometric relationship is then used to determine the pulmonary capillary blood flow or cardiac output of the patient. |
Author | KUECK KAI ORR JOSEPH A |
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Title | Methods for accurately, substantially noninvasively determining pulmonary capillary blood flow, cardiac output, and mixed venous carbon dioxide content |
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