| 摘要 |
A method and apparatus for the non-invasive determination of cardiac output of a subject, by: (a) causing the subject to inhale and exhale air via a respiratory tube in a plurality of breathing cycles including normal breathing cycles in which the inhaled air does not receive any significant amount of exhaled air from the preceding cycle, and rebreathing cycles in which the inhaled air receives an end tidal portion of the exhaled air from the preceding cycle; (b) measuring the carbon dioxide content in the exhaled air during both the normal breathing cycles and the rebreathing cycles; and (c) utilizing the carbon dioxide content measurements to determine the cardiac output of the subject.
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