Apparatus and method for non-invasively measuring cardiac output
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United States of America Patent
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Nov 18, 2003
Grant Date -
Oct 11, 2001
app pub date -
Feb 6, 2001
filing date -
Dec 19, 1996
priority date (Note) -
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Abstract
Apparatus and methods for non-invasively determining the cardiac output or pulmonary capillary blood flow of a patient using partial re-breathing techniques. The apparatus includes a substantially instantaneously adjustable deadspace volume for accommodating differences in sizes or breathing capacities of various patients. The apparatus may be constructed of inexpensive elements, including one or more two-way valves, which render the apparatus very simple to use and inexpensive so that the unit may be employed as a disposable product. The method of the invention includes estimating the cardiac output or pulmonary capillary blood flow of a patient based on partial pressure of alveolar CO.sub.2, rather than on the partial pressure of end tidal CO.sub.2, as previously practiced. A computer program for calculating the cardiac output or pulmonary capillary blood flow of a patient is also disclosed.
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