A Measurement Method for the Cardiac Output Anti Oxygen Fluctuations

• 1、College of Instrumentation & Electrical Engineering,Jilin University

Abstract：Cardiac output is a important index in evaluating cardiac health, has important reference value in the critical condition assessment and surgery monitoring. The current clinical noninvasive method for cardiac output is pulse dye spectrophotometry, the method takes the blood oxygen saturation is 100% as the foundation, by measuring the indocyanine green pigment concentration indirectly calculated cardiac output, this will lead to the calculated value of cardiac output there is a certain error. Aimed at this problem, this paper puts forward a kind of anti oxygen noninvasive cardiac output fluctuation interference detection method, based on the theory of lambert - beer's law, realized with pigment of spectrophotometry measuring pulse indocyanine green pigment concentration of correction. After injection of indocyanine green in the human body, collected 660 nm, 805 nm and 940 nm wavelength transmission signal in the human fingers, then upload the data to the computer, indole cyanogen green pigment concentration curve and cardiac output is obtained by calculation. In this paper, the proposed method and pulse dye spectrophotometry measuring results, respectively, with the most accurate measurement of cardiac output in comparison with the measured results of thermal dilution method, measurement error is obviously improved. The experimental results show that the method improve the accuracy of measurement of cardiac output, for clinical provides a more accurate detection method in cardiac output.

Keywords： Optoelectronics and laser technology Indocyanine green(ICG)；Pulse wave；Cardiac output；Pulse dye spectrophotometry