Apparatus and method for non-invasively measuring cardiac...

Surgery – Diagnostic testing – Respiratory

Reexamination Certificate

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C073S023300, C422S084000

Reexamination Certificate

active

06908438

ABSTRACT:
Apparatus and methods for non-invasively determining cardiac output using partial re-breathing techniques are disclosed in which the apparatus is constructed with an instantaneously adjustable deadspace for accommodating differences in breathing capacities of various patients. The apparatus is constructed of inexpensive elements, including a single two-way valve which renders the apparatus very simple to use and inexpensive so that the unit may be readily disposable. The method of the invention provides a novel means of estimating cardiac output based on alveolar CO2values rather than end-tidal CO2values as previously practiced. A program for calculating cardiac output is also disclosed.

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