Cardiac output detection by multiple frequency thermodilution

Details Cardiac output detection by multiple frequency thermodilution Cardiac output detection by multiple frequency thermodilution

1978-10-20

1980-12-02

Michell, Robert W.

Surgery

Truss

Pad

73204, A61B 502

Patent

active

042365279

ABSTRACT:
Method and apparatus for measuring cardiac output in which a traceable signal in the form of thermal energy or an injectate is applied to the blood flow through the heart having a plurality of frequency components with the traceable signal detected at a heart output vessel and analyzed at the plural frequency components to provide cardiac output rate and ejection fraction information. The traceable signal is preferably heat energy applied as a very low frequency modulation of a high frequency signal at a fundamental and further harmonic or as a square wave in which multiple harmonics are present. At least two frequency components of the square wave are then separately analyzed. A multiple frequency system in addition to permitting analysis of previously undetectable heart output characteristics additionally permits determination of whether the source of the traceable signal is properly located within the heart such as in the ventricle.

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patent: 3719083 (1973-03-01), Morris et al.
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Nealeigh, R. C. et al., "A Venous Pulse Doppler Catheter Tip Flowmeter for Measuring Arterial Blood Vel., Flow & Diam.," ISA Transactions, vol. 15, No. 1, pp. 84-87.
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Runyan, R. A. et al., "Empir. Method for Freq. Comp. for Hot Wire Anemometer," NACA Tech. Note 1331, Jun. 1947.

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