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• W2461201831 abstract "Recently, the hepatic circulation in hemorrhagic shock has been investigated by HEINEMANN, BRADLEY, SELKURT, FRANK and others. However, the opinions among the authors have not yet been in agreement but rather controversial, par icularly, as to the relationship between hepatic blood flow and cardiac output. HEINEMANN reported that hepatic blood flow fell sharply following hemorrhage and then returned spontaneously the control level in absence of the restoration of blood pressure. While, the others reported that hepatic blood flow did not recovered and remained in decreased level, having the same trend in blood pressure change. It seems likely that such a controversy will be partly due to the difference of the methods employed in measuring hepatic blood flow and partly to the confusion in recognizing the stage of shock, because the sequence of respective hemodynamic phenomenon is considerably different at the period of observation in this condition. The purpose of the present paper is to classify the relationship of hepatic blood flow and cardiac output throughout the entire course of hemorrhagic shock and its bearing on the irreversibility of shock. Oxygen utilization in the splanchnic viscera was also studied. The Relationship between Hepatic Blood Flow and Cardiac Output 1) Methods : Hepatic blood flow was measured by modified Frank's method. Twenty-two dogs ranging in weight from 8 to 20 kg were used and anesthetized with intravenous pentobarbital sodium of 25 mg/kg. A polyethylene catheter was passed through a right external jugular vein into the hepatic vein and then wedged into one of hepatic lobar veins. The outer end of the catheter in the hepatic vein was fixed at the level of the vena cava and allowed to drain continuously. The rate of hepatic outflow was measured by a graduated cylinder and stop watch. The blood collected was returned by transfer to an elevated burette draining into a left external jugular vein. Heparin (3-5 mg/kg) was given intravenously during the experiments. Cardiac output was calculated from indicator dilution curves according to the STEWART-HAMILTON principle. Two different procedures were used. In one method 32P labelled red cells were used as an indicator and injected intravenously. Blood samples were collected successively from the femoral artery. In another cases, radio-iodinated serum albumin (RISA) was injected as an indicator. Cardiac output was calculated from radio-cardiograms by using a scintillation detector at the heart region and a rate-meter. 2) Results : We could distinguish the following two stages in hemorrhagic shock in relation to hepatic blood flow and cardiac output. a) The first stage : In the early stage of shock, hepatic blood flow decreases in parallel with the changes in cardiac output. b) The second stage : After same delay from the initial bleeding, hepatic blood flow decreases progressively without marked reduction in cardiac output. Consequently, a difference or gap appears in percentile changes of hepatic blood flow and cardiac output. c) Effects of transfusion : Complete recovery of arterial pressure, cardiac output and hepatic blood flow can be obtained by a transfusion performed in the first stage. Whereas, the transfusion made in the second stage give rise only transient recovery of arterial pressure and cardiac output." @default.
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• W2461201831 date "1964-01-01" @default.
• W2461201831 modified "2023-10-18" @default.
• W2461201831 title "Hepatic Blood Flow, Cardiac Output and Splanchnic Oxygen Utilization in Experimental Hemorrhagic Shock" @default.
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• W2461201831 doi "https://doi.org/10.1253/jcj.28.704" @default.
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