[A Measurement Method for the Hepatic Functional Reserves Anti Oxygen Fluctuations]

Hepatic functional reserves parameters are the key indictors to assess if the hepatic metabolic function is normal, they are also the important basis to a successful hepatectomy. Currently clinical hepatic functional reserves parameters are achieved through Indocyanine Green (ICG) concentration measurement in the method of pulse dye spectrophotometry, with the assumption that blood oxygen saturation is 100%, this hypothetical bias leads to an error in the calculated value of the hepatic functional reserves parameters. In order to solve this problem, hepatic functional reserves parameters measurement that resist fluctuation from blood is presented. The method is based on the modified Lambert Beer's law and realize the correction of ICG concentration measurement in the method of pulse dye spectrophotometry. While the ICG is injected into the patient's body by the cubital veins, using the data acquisition unit that developed by project team to collect 805 nm, 940 nm wavelengths of transmission signals and 730 nm, 805 nm and 890 nm wavelengths of reflected signals in the fingertip skin synchronously, and then upload 5 sets of data to the computer. Draw the ICG concentration curve according the collected data and blood oxygen saturation before injecting ICG to the human body and then calculate the characteristic parameters, according to the characteristic parameters calculate the hepatic reserves functional parameters. Taking the measurement of effective hepatic blood flow as an example, the relative error was obviously decreased when comparing this method and the pulse dye concentration method with the electromagnetic flowmeter (EMF) measurement which is the most accurate method to measure effective hepatic blood flow (EHBF) respectively. The results demonstrate that this method can improve the accuracy of hepatic reserves parameters, and it can also provide a more accurate detection method of hepatic functional reserves parameters for clinical application.